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Interventions in sports settings to reduce risky alcohol consumption and alcohol-related harm: a systematic review

Abstract

Background

Elevated levels of risky alcohol consumption and alcohol-related harm have been reported for sportspeople and supporters compared to non-sporting populations. Limited systematic reviews have been conducted to assess the effect of interventions targeting such behaviours.

Methods

A review was undertaken to determine if interventions implemented in sports settings decreased alcohol consumption and related harms. Studies were included that implemented interventions within sports settings; measured alcohol consumption or alcohol-related injury or violence and were either randomised controlled trials, staggered enrolment trials, stepped-wedged trials, quasi-randomised trials, quasi-experimental trials or natural experiments. Studies without a parallel comparison group were excluded. Studies from both published and grey literature were included. Two authors independently screened potential studies against the eligibility criteria, and two authors independently extracted data from included studies and assessed risk of bias. The results of included studies were synthesised narratively.

Results

The title and abstract of 6382 papers and the full text of 45 of these papers were screened for eligibility. Three studies met the inclusion criteria for the review. One of the included studies was a randomised controlled trial (RCT) of a cognitive-behavioural intervention with athletes within an Olympic training facility in the USA. The study reported a significant change in alcohol use between pre-test and follow-up between intervention and control groups. The other two studies were RCTs in community sports clubs in Ireland and Australia. The Australian study found a significant intervention effect for both risky alcohol consumption at sports clubs and overall risk of alcohol-related harm. The Irish study found no significant intervention effect.

Conclusions

A limited number of studies have been conducted to assess the effect of interventions implemented in sports settings on alcohol consumption and related harms. While two of the three studies found significant intervention effects, it is difficult to determine the extent to which such effects are generalisable. Further controlled trials are required in this setting.

Systematic review registration

PROSPERO CRD42014001739

Background

Alcohol consumption is a causal component of more than 200 diseases, injuries and other health conditions [1]. The diseases and conditions to which alcohol contributes are diverse due to multiple mechanisms of effect including the toxic effects on tissues and organs; dependence and subsequent lack of self-control over drinking behaviour and intoxication, whereby physical coordination, perception, cognition, consciousness and behaviour are impaired [24]. Worldwide, excessive alcohol consumption is responsible for 5.9 % of deaths and 5.1 % of the global burden of disease (as measured in disability adjusted life years (DALYs)) [4]. In 2012, this equated to approximately 3.3 million deaths and 139 million DALYs [4]. Such alcohol-related harm not only affects the user [4] but other people who have contact with the user such as family, friends and co-workers [5, 6] and society at large [3, 7, 8].

For most alcohol-related harms, there is a dose-response relationship between the amount (volume) of alcohol consumed and the risk of harm [9]. Consistent with such evidence, governments around the world have issued guidelines on the maximum amount of alcohol that is recommended to be consumed in order to reduce the harmful effects of alcohol in both the short (e.g. injury when intoxicated) and longer term (e.g. liver cirrhosis due to alcohol toxicity) [10].

People who engage in sports, either as players or fans, are more likely to consume alcohol at levels that put them at risk of short- and long-term harm compared to people not involved in sports. For instance, Weschler et al. 1997 found that in the USA, frequent heavy episodic drinking (≥3 heavy drinking episodes in the past 2 weeks) was more common amongst college student athletes (males 29 %; females 24 %) than students who were not athletes (males 18 %; females 15 %) [11]. Nelson et al. (2001) also found that a significantly higher proportion of US college athletes (57 %) reported binge drinking (≥5drinks) compared to students who were not athletes (49 %) [12]. Similar high levels of risky consumption have been found more recently amongst amateur and professional sportspeople in countries including Australia [13], Ireland [14], New Zealand [15, 16] and Brazil [17]. For instance, in New Zealand, O’Brien et al. 2005 found greater rates of binge drinking (≥6 drinks at least weekly) amongst sportspeople at the international/country elite level (59 %), provincial elite level (56 %) and non-elite level (51 %) compared to non-sportspeople (31 %) [16]. Similarly, a survey of Australian Football League (AFL) players by Dietze et al. (2008) found that the proportion of players that reported risky/high risk drinking for short-term harm (≥7 drinks on any 1 day on a monthly basis) ranged from 51 % during the playing season to 88 % at the end of the playing season, a proportion significantly greater than that for males in the general population (44 %) [18]. Higher levels of alcohol consumption have also been reported amongst spectators/fans when they are at games compared to when not at games and compared to non-spectator populations [19, 20].

Such heavy episodic drinking by sportspeople and fans has resulted in increased levels of alcohol-related harm amongst these population groups. In a recent systematic review, 10 of 11 included studies found higher rates of alcohol-related aggression and violence in sporting populations compared to non-sporting populations. Increased levels of aggression or violence amongst sports players and spectators were reported among middle/high school students, college/university students, current/former athletes and general adult populations at both elite and non-elite levels [21]. For instance, in a study by O’Brien et al. (2012), university sportspeople in Australia were over one and half times more likely than non-sportspeople to display aggressive behaviours such as verbal insults or assaults when intoxicated (OR 1.65; 95 % CI 1.19, 2.28) and almost twice as likely to damage property (OR 1.98; 95 % CI 1.38, 2.84) [22]. Similarly, in a study of amateur players of Gaelic football and hurling in Ireland, a significantly greater proportion of players reported getting in a fight due to their drinking (32 %) compared with a national sample of men of similar age (15 %) [14].

Given the disproportionate amount of alcohol-related harm experienced by people involved with sports, interventions to address excessive alcohol use within the sports setting have been recommended to reduce alcohol-related harm internationally by the World Health Organisation [23], governments [24] and experts [25].

To our knowledge, only two systematic reviews have been conducted assessing interventions targeting alcohol consumption and related harms in the sports setting [26, 27]. The first of these sought to review controlled trials of policy-based interventions in sporting organisations [26] but did not find any studies that met the inclusion criteria. The review included studies up until May 2007, those with a policy-focused intervention and an alcohol consumption outcome [26]. The second review [27] of alcohol harm reduction interventions in sports settings included five studies, all which were cross-sectional studies of the same multiple-component alcohol management intervention in community sporting clubs within Australia. The included studies reported significant improvements in alcohol consumption [28, 29], drink-driving [30, 31] and club revenue [32]. The review was limited to papers that were published in English and published in peer-reviewed journals, potentially excluding studies included in theses and dissertations, and other grey literature, such as government reports and unreported findings from studies reported in trial registries. The review was also limited to interventions that targeted adult populations of workplace employees or athletes, potentially excluding studies with adolescent populations and other people attending sporting venues, such as fans. Finally, the review did not conduct any assessment of the methodological quality of the included studies [33].

Objectives

This review sought to determine if interventions implemented in the sports setting are effective relative to a comparison group in:

  1. 1.

    Reducing alcohol consumption at the sporting venue and/or overall alcohol consumption,

  2. 2.

    Reducing excessive alcohol consumption or intoxication at the sporting venue and/or overall excessive alcohol consumption or intoxication, and

  3. 3.

    Reducing alcohol-related violence or injury at the sporting venue and/or overall alcohol-related violence or injury.

Methods

The review was undertaken according to the methods prescribed in the Cochrane Handbook for Systematic Reviews of Interventions [33] and is reported according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) [34]. A full report of the methods is available in the published review protocol [35].

Eligibility criteria for included studies

Interventions

Studies were eligible to be included in the review if the intervention was implemented in a sporting setting and aimed to modify alcohol consumption behaviour and/or alcohol-related intoxication and/or or alcohol-related violence or injury. Interventions that aimed to address such outcomes, but also aimed to modify one or more additional health risk behaviour, were also eligible. Interventions could include, but were not limited to, health promotion, health education, regulatory or environmental initiatives. Interventions with a treatment focus were excluded. Sports settings were defined as settings (e.g. arenas, stadiums, grounds, complexes or ovals) where an organised sporting event or activity occurred either at a professional (elite) or non-professional (amateur/community) level, including competition games, training sessions or other club or team events.

Comparisons

Studies were eligible for inclusion in the review if they included a no intervention, attention or waitlist control group or an alternative intervention.

Primary outcomes

Studies with the following primary outcome measures were eligible for inclusion in the review: (1) alcohol consumption, such as number of drinks consumed or alcohol consumed at excessive/risky levels; (2) alcohol-related intoxication or (3) alcohol-related violence or injury. These measures could be assessed by any method, including surveys, observations, biochemical measures or police or medical records.

Study design

Studies with the following study designs were eligible to be included in the review: randomised controlled trials, including cluster randomised controlled trials; staggered enrolment trials [36] or stepped-wedged trials [37]; quasi-randomised trials, where group allocation is not purely random [38, 39]; quasi-experimental trials with comparison/control groups, including non-randomised pre-post (before-after) trials with one or more intervention and control groups [40], time-series/interrupted time-series trials (including multiple baseline trials) with independent control groups [36, 40], preference trials [37] and regression discontinuity trials [36] and natural experiment studies that have a comparison group [41]. Any trials without parallel comparison or control groups were excluded.

There was no eligibility criteria based on the length of follow-up, year of study publication, language, study publication status or study source (e.g. grey literature).

Information sources and search strategy

Based on the abovementioned study eligibility criteria, a search strategy was developed and executed across the following electronic databases on the 20th August 2015: the Cochrane Central Registry of Controlled Trials (CENTRAL) (1974-); The Cochrane Library (1992-); MEDLINE (1946-); EMBASE (1947-); PsychINFO (1806-); SPORTDiscus (1985-); Dissertations and Theses (1743-); ERIC (1966-); PsycEXTRA (1908-) and CINAHL (1937-) (See Additional file 1).

The following sources were also searched (completed on 27th August 2015):

  1. (1)

    The contents of the peer-reviewed journals ‘Addiction’, ‘Journal of Studies on Alcohol and Drugs’ and ‘Medicine and Science in Sports and Exercise’ for the period May 2009–August 2015,

  2. (2)

    The first 200 citations from a Google Scholar search using search terms ‘alcohol’ AND ‘sport’ AND ‘program/programme OR intervention OR strategy’,

  3. (3)

    The results of searches of trial registries and the following topic relevant internet databases using the search terms ‘alcohol’ AND ‘sport’ AND ‘program/programme OR intervention OR strategy’—Alcohol and Alcohol Problems Science Database [http://etoh.niaaa.nih.gov/]; BiblioMap [http://eppi.ioe.ac.uk/webdatabases/Intro.aspx?ID=7]; Lifestyle Information Network [http://lin.ca/recreation-database]; SportScan Article Database [http://www.ausport.gov.au/information/archived/catalogue/nsic_catalogue]), and

  4. (4)

    The reference lists of included studies.

The authors of included trials were also contacted via email and asked to nominate any relevant trials.

Study selection/screening

Following the removal of duplicate papers, two review authors independently screened the titles and abstracts of all papers identified through the search described above, assessing study eligibility using a standardised, pre-piloted screening tool and Endnote (version X7.0). Papers that did not meet the eligibility criteria were excluded. The same two reviewers independently examined the full text of all papers that were either deemed eligible or for which eligibility was uncertain. Any differences between reviewers in determining study eligibility were resolved by consensus and consultation with a third reviewer. Reasons for study ineligibility were recorded for all full-text papers and are described in Table 1. For papers where there was insufficient information to determine eligibility, the study authors were contacted for clarification. Review authors were not blinded to the name or institution of study authors or to journal titles.

Table 1 Reasons for exclusion of studies after full-text review

Data extraction

Two review authors independently extracted data from eligible studies. A pre-piloted form based on the data extraction form in the Cochrane Handbook for Systematic Reviews of Interventions [33] was used to extract data for both evidence synthesis and assessment of study quality. Extracted information included authors; study setting (including country, type of sport and level of professionalism); study population and participants demographics (including age, gender and role, such as player or spectator/fan); study design; intervention and control conditions; trial outcomes and results and information for the assessment of study bias. As per the review protocol [35], it was anticipated that there may be a range of outcome measures across studies due to wide variation in measures of alcohol consumption, intoxication and harm. As such, no specific outcome measures were pre-specified. Where there were multiple papers reporting on the one study, the papers were grouped together and relevant information from across the papers used to complete the one data extraction form. Disagreement regarding data extraction was resolved through discussion between the two reviewers and, if required, consultation with a third reviewer. Study authors were contacted for data that were not available from the paper. Review authors that were extracting data were not blinded to the name or institution of study authors or to journal titles.

Upon finalisation of the data extraction process, one review author transferred study information into the included studies (Table 2) and a second review author checked the data.

Table 2 Characteristics of included studies

Assessment of risk of bias

Two review authors independently assessed risk of bias in eligible studies by assessing the adequacy of study characteristics as outlined in the Cochrane Handbook for Systematic Reviews of Interventions [33]. Disagreement regarding assessment of risk of bias was resolved through discussion between the two reviewers and, if required, consultation with a third reviewer.

For any non-randomised trials, the authors planned to assess selection bias that may have led to confounding of the outcome of interest and the appropriateness of any statistical methods used to adjust for such confounding. Additional biases specific to individual study designs were planned to be assessed on a case-by-case basis and in consultation with relevant methodological experts and noted in a supplementary risk of bias table.

Data synthesis and analysis

Intervention effects for the relevant outcomes of all included studies were described narratively. It was planned that Review Manager (RevMan Review Manager (RevMan) [Computer program] Version 5.2. Copenhagen: The Nordic Cochrane Centre, The Cochrane Collaboration, 2012) be used to undertake meta-analyses using a random effects model where outcome data reported by included trials enabled pooling and where trials were sufficiently homogeneous in terms of participants, interventions and outcome characteristics. For cluster randomised controlled trials (RCTs), meta-analyses were planned to be performed using adjusted effect size estimates and standard errors using the generic inverse variance method in Revman. For cluster trials where suitable adjusted effects were not reported, an effective sample size was planned to be calculated using the intra-class correlations provided in study reports.

Assessment of study heterogeneity

It was planned that heterogeneity between studies be assessed using both visual inspection of forest plots and the I 2 statistic. An I 2 value greater than 50 % was planned to be considered indicative of substantial heterogeneity.

Results

Results of the search

The searches generated 6382 papers (following duplicate removal). Screening of titles and abstracts identified 45 papers for full-text review (see Additional file 2: PRISMA flowchart). Of these, three trials (Carr 1992 [42]; O’Farrell 2010 [43]; Kingsland et al. 2015 [44]) met the inclusion criteria.

Excluded studies

Of the 45 papers for which the full text was examined, 37 were deemed ineligible (Additional file 2: PRISMA flowchart). Six were deemed ineligible based on participants, four based on outcome, 10 based on having no parallel comparator, 15 based on intervention and two based on study design (Table 1).

Characteristics of included studies

A description of the included trials is presented in Table 2. In the Carr 1992 trial, individual athletes residing at a training facility in the USA were randomised to control (n = 23) and intervention (n = 30) groups [42]. The trial intervention was based on a cognitive-behavioural model and was delivered in three separate sections: (1) an education component on the effects of substance misuse (2.5 h); (2) a decision-making/coping skills component (3 h) and (3) a social skill/self-esteem component (2.5 h). Each component included lecture presentations, group discussion, role-play exercises and written materials. The control group received no intervention during the trial period. Trial outcomes were assessed pre-intervention, immediately post-intervention and at a 7-week post-intervention follow-up via self-administered questionnaires and included a measure of how often alcohol was used in the last month [42].

The study by Kingsland et al. (2015) was a cluster randomised controlled trial, with 42 community-level, non-elite football (Australian Rules, Soccer/Association Football, Rugby League and Rugby Union) clubs randomly allocated to the intervention group and 45 such clubs allocated to the control group [44]. The 2.5-year intervention involved the participating clubs implementing responsible alcohol management strategies, including reduced pricing of low and non-alcoholic drinks, responsible service of alcohol training of staff and restrictions on drinking games and promotion that encourage rapid intoxication. The control clubs received written materials unrelated to the outcome measures. Repeat cross-sectional surveys of players, supporters and officials were employed at pre- and post-intervention to measure trial outcomes. The trial outcomes included risky alcohol consumption (≥5 drinks on the one occasion) at least once a month at the sports club and the following measures of overall alcohol consumption risk: median total Alcohol Use Disorders Identification Test (AUDIT) score; total AUDIT score of ≥8; AUDIT alcohol consumption/hazardous use subscale score of ≥6; AUDIT dependence subscale score of ≥4 and AUDIT alcohol-related problems/harmful use subscale score of ≥1. Data were collected from 1411 participants pre-intervention and 1144 participants post-intervention [44].

The study by O’Farrell (2010) involved a cluster-controlled trial in Gaelic football and hurling clubs. All sports clubs in one county within Ireland acted as control clubs (n = 29) and randomly selected clubs within another county participated in the trial as intervention clubs (n = 12) [43]. The two participating counties were selected on a convenience basis. Intervention strategies were implemented over a 4-month period and involved strategies at the community level (e.g. media campaign), club level (e.g. responsible alcohol service practices) and player level (e.g. education). Repeat cross-sectional surveys were used at pre- and immediately post-intervention to measure trial outcomes. Trial outcomes included yearly alcohol consumption (litres of pure alcohol); consumption of ≥21 standard alcoholic drinks per week; binge drinking (≥6 standard alcoholic drinks in one sitting); mean total AUDIT score; total AUDIT score of ≥8; AUDIT alcohol consumption/hazardous use subscale score of ≥6; AUDIT dependence subscale score of ≥4 and AUDIT alcohol-related problems/harmful use subscale score of ≥1. The study also included a mean alcohol-related harm score as a measure of overall alcohol-related violence or injury. Data were collected from 960 players pre-intervention and 659 post-intervention [43].

For all trials, alcohol harm reduction was the primary aim and focus of the intervention.

Risk of bias in included studies

The level of risk of bias is presented separately for each study in Fig. 1 and as a combined study assessment of risk of bias in Fig. 2. Additional file 3 contains justification for each risk assessment.

Fig. 1
figure1

Risk of bias summary: review authors’ judgments about each risk of bias item for each included study

Fig. 2
figure2

Risk of bias graph: review authors’ judgments about each risk of bias item presented as percentages across all included studies

Risk of selection bias differed across studies. Only Kingsland et al. 2015 [44] reported appropriate random sequence generation and club allocation concealment methods and, therefore, was assessed as having a low risk of selection bias. All included studies were public health interventions in which it was not possible for participants or study personnel to be blind to group allocation, and therefore, risk of performance bias was deemed to be high for all studies. For all studies, all outcome measures were self-reported by participants and subsequently detection bias was deemed to be high for two out of three studies. For Kingsland et al. 2015 [44], such risk was deemed to be unknown because while club members who self-reported study outcomes were not intentionally blinded from knowing which group their club was allocated to, their knowledge of this is unknown and the research personnel collecting outcome data by telephone surveys were blind to group allocation. Risk of attrition bias differed across studies. Only Kingsland et al. 2015 [44] reported undertaking intention-to-treat analysis and therefore scored low in regard to risk of attrition bias. For all studies, risk of reporting bias was deemed to be low as either all planned outcomes were reported or explanation provided as to why this was not the case. For the two cluster trials [43, 44], the potential risk of bias due to sports club member/player selection was assessed. For both studies, risk of such selection bias was deemed to be low due to the use of either a quasi-random or census approach.

Effect of intervention

The intervention effects of individual studies are summarised in Table 3.

Table 3 Intervention effects of included studies

Reducing alcohol consumption at the sporting venue and/or overall alcohol consumption

Carr 1992 reported a significant difference between the intervention and control groups in change in alcohol use frequency between pre-test and follow-up (X 2 = 6.42, P < 0.05) [42]. In the intervention group, 3.6 % reported decreased use, 89.3 % no change and 7.1 % increased use and, in the control group, 21.1 % reported decreased use, 57.9 % no change and 21.1 % increased use. There was no significant difference in frequency of alcohol use in the last month between the groups at pre-test (X 2 = 5.94, P = 0.20), post-test (X 2 = 5.48, P =0.24) or follow-up (X 2 = 5.96, P = 0.20) [42].

In the cluster RCT by O’Farrell (2010), there was no significant difference in mean yearly overall alcohol consumption (in any setting) at post-intervention between control (11.6 L; 95 % CI 9.2, 14.2) and intervention groups (8.8 L; 95 % CI 5.6, 12.1) (P = 0.17) [43]. Kingsland et al. (2015) did not report any such overall measures of alcohol consumption volume [44].

Reducing excessive alcohol consumption or intoxication at the sporting venue and/or overall excessive alcohol consumption or intoxication

Kingsland et al. 2015 was the only trial that reported an outcome related to excessive alcohol consumption at a sporting venue [44]. At baseline, 27 % of intervention club and 25 % of control club members reported consuming alcohol at risky levels (≥5 drinks) at their sports club. Post-intervention, a significantly smaller proportion of intervention club members (19 %) reported such a level of alcohol consumption at their sports club compared to control club members (24 %) (OR = 0.63 95 % CI 0.40–1.00, P = 0.05) [44].

Kingsland et al. 2015 [44] and O’Farrell 2010 [43] were the only studies that reported data measuring the impact of interventions on overall excessive alcohol consumption in any setting. Both studies used the same measures of alcohol-related harm (overall AUDIT score and AUDIT subscale scores), and these data were pooled. However, statistically heterogeneity was high (I 2: 76–87 %).

Kingsland et al. 2015 found that a significantly lower proportion of intervention group club members (38 %) reported AUDIT scores above eight compared to control group club members (45 %), post-intervention (OR = 0.58 (95 % CI 0.38–0.87, P < 0.01) [44], whereas, O’Farrell did not find any significant difference between treatment groups for this measure (post-intervention: control 69.9 % (95 % CI 64.1–76.8, intervention: 72.2 % (95 % CI 63.7–80.6; P = 0.6)) [43].

Kingsland et al. (2015) reported significant intervention effect with respect to the AUDIT alcohol consumption subscale (post-intervention: control 55 %, intervention 47 % (OR = 0.60 95 % CI 0.41–0.87 P value <0.01)) and the AUDIT alcohol dependence subscale (post-intervention: control 4 %, intervention 1 % (OR = 0.20 95 % CI 0.06–0.65 P value <0.01)) [44]. In contrast, O’Farrell found no such effects (AUDIT alcohol consumption subscale, post-intervention: control 95.1 % (95 % CI 92.6–97.6); intervention 95.0 % (95 % CI 91.5–98.6) (P = 0.97); AUDIT dependency subscale: post-intervention: control 60.5 % (95 % CI 53.2–67.8); intervention 59.7 % (95 % CI 49.2–70.1) (P = 0.90)) [43].

Neither Kingsland et al. (2015) (post-intervention: control 45 %; intervention 41 % (OR = 0.67 95 % CI 0.43–1.03 P = 0.07) [44] nor O’Farrell (2010) found a significant intervention effect with respect to the AUDIT alcohol-related problems subscale (post-intervention: control 68.5 % (95 % CI 63.1–73.8), intervention 74.8 % (95 % CI 67.1–85.6) (P = 0.17)) [43].

Kingsland et al. 2015 found a significant difference in median AUDIT score between members of control and intervention group sports clubs post-intervention (control: 7 (range = 0, 25); intervention: 6 (range = 0, 26) (P < 0.01)) [44]. O’Farrell 2010 did not find any significant difference between intervention and control groups in the proportion of players reporting consumption of 21 or more standard drinks per week (post-intervention: control 28.5 % (95 % CI 21.4–35.7), intervention 20.1 % (95 % CI 10.6–29.5); P = 0.15), the proportion of players reporting consumption of six or more drinks in one setting (‘binge drinking’) (post-intervention: control 43.5 % (95 % CI 35.2–51.8), intervention 49.1 % (95 % CI 37.8–60.3); P = 0.42), mean total AUDIT score (post-intervention: control 11.0 (95 % CI 10.4–11.7); intervention 11.0 (95 % CI 10.0–11.4); P = 0.94) or mean alcohol harm score (post-intervention: control 3.0 (95 % CI 2.5–3.6), intervention 2.5 (95 % CI 1.7–3.3); P = 0.26) [43].

Reducing alcohol-related violence or injury at the sporting venue and/or overall alcohol-related violence or injury

No included studies reported separate, discrete measures of alcohol-related violence or injury.

Due to the heterogeneity of included studies, no quantitative data synthesis was undertaken.

Discussion

Despite evidence demonstrating elevated levels of risky alcohol consumption and alcohol-related harm amongst people involved in sports and recommendations for the development of interventions to address this risk, the review identified only three controlled trials of relevant interventions within the sports setting. Two of the included studies reported a positive effect on one or more alcohol consumption or alcohol-related harm outcome either within the sports setting or overall [42, 44]. As none of the included trials reported discrete alcohol-related violence or injury outcomes, the impact of such interventions on injury or violence in sporting club contexts is unknown.

The findings of the study by Carr (1992) were equivocal as they indicate that while 7.1 % of the intervention group reported increased alcohol use compared with 21.1 % of the control group, 3.6 % of the intervention group reported decreased use of alcohol compared with 21.1 % of the control group [42]. As such, it is unclear whether the cognitive-behavioural intervention targeting substance use by athletes in training settings was effective in reducing alcohol misuse and related harms. The findings should also be considered in the context of a rating of high risk of performance bias, detection bias and attrition bias, which further supports the equivocal nature of the reported findings. Findings of reviews of similar interventions (social norm, motivational interviewing) in young adults in college/university and non-college settings have found no meaningful benefits associated with such interventions for the prevention of alcohol misuse [45, 46].

The two included randomised controlled trials that tested the impact of multicomponent alcohol harm reduction interventions in community sports clubs reported mixed results. The intervention reported by Kingsland et al. 2015 was effective in reducing risky alcohol consumption by club members within the community football club setting and the risk of alcohol-related harm to club members as measured by AUDIT [44], whereas the O’Farrell 2010 study found no intervention effect across all related outcomes [43]. These two studies differed in a number of ways. For example, the intervention in the Kingsland et al. (2015) trial [44] was implemented over 2.5 years whereas the O’Farrell (2010) trial [43] was implemented for 4 months. A longer implementation period potentially afforded the Kingsland et al. (2015) [44] trial both more time for the intervention to change alcohol-related harm outcomes, as well as a greater dose of intervention, both of which have been found to be associated with intervention effectiveness [47]. These findings should also be considered in the context of the risk of bias assessment. The O’Farrell (2010) [43] study was considered to have a potentially high risk of bias across four (selection bias x 2; performance bias; detection bias) of the seven items, whereas, the study by Kingsland et al. (2015) [44] was rated as high risk of bias for only performance bias. As such, the findings from the Kingsland et al. (2015) [44] study are potentially more reliable than those of O’Farrell (2010) [43].

No studies were found that examined the effectiveness of interventions in reducing alcohol consumption or alcohol-related harm by players or spectators in large sporting venues, such as arenas and stadia. This is despite evidence from Europe [48], the USA [49] and New Zealand [50] that suggests that sporting clubs and venues fail to implement alcohol management practices comprehensively and consistently. For instance, Drygas et al. reported that only 22 % of 88 sports stadiums across 10 European countries implemented initiatives to encourage responsible alcohol use [48], and Lenk et al. found that only 27 % of 66 professional sports stadiums in the USA implemented ‘11 or more’ of 12 alcohol control policies/practices [49]. The findings are also limited in their generalisability beyond the countries in which they were conducted, where the sporting venues, populations and cultures may differ. For instance, despite emerging data from countries including Brazil [17] and Japan [51] regarding elevated levels of alcohol-related harm amongst sporting populations, the potential to generalise the findings of studies from Ireland and Australia to such countries is unknown.

Compared to previous systematic reviews of interventions to reduce alcohol-related harm in the sports setting, this review included three controlled trials that had not been reported in previous reviews [26, 27], primarily due to the date range of the search and the inclusion of grey literature. The review conducted by Kolar et al. (2015) [27] included five cross-sectional studies on the same intervention, which was also the same intervention trialled by Kingsland et al. (2015) in the study included in this review. As reported by Kolar et al. (2015) [27], these five studies reported significant intervention effects in alcohol consumption [28, 29], drink-driving [30, 31] and club revenue [32] and, as such, further support the findings of Kingsland et al. (2015).

A number of potential methodological limitations of the review need to be noted. First, a design filter was used to manage the search, as is suggested for complex reviews of public health and health promotion interventions [33]. As such, the review needs to be considered in this context as, while it is considered unlikely, the inclusion of a design filter may have resulted in potentially eligible studies being missed. Second, some studies may have been missed through limitations of the databases searched and non-publication of studies with negative results.

Given the paucity of controlled trials of interventions in the sports setting that aim to reduce risky alcohol consumption and alcohol-related harm and the variable quality and findings of those that have been conducted, further high quality trials are required in order to determine if such interventions are broadly effective and should be further adopted by policy makers and sports administrators.

Conclusions

A limited number of studies have been conducted to assess the effect of interventions implemented in sports settings on alcohol consumption and related harms. While two of the three studies found significant intervention effects, it is difficult to determine the extent to which such effects are generalisable. Further controlled trials are required in this setting that adhere to high standards of trial methodology, particularly in professional sports settings where there is currently an absence of such research trials.

Abbreviations

AFL:

Australian Football League

AUDIT:

Alcohol Use Disorders Identification Test

DALYs:

disability adjusted life years

PRISMA:

Preferred Reporting Items for Systematic Reviews and Meta-analyses

RCT:

randomised controlled trial

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Acknowledgements

The authors would like to acknowledge the contribution of Debbie Booth from The University of Newcastle who provided guidance regarding the search strategy and conducted the search of electronic databases, to The University of Newcastle and Hunter New England Population Health for supporting author salaries and to the Hunter Medical Research Institute for infrastructure support.

Funding statement

The University of Newcastle, Priority Research Centre for Health Behaviour provided funding for KV to be employed on the review.

Author information

Correspondence to Melanie Kingsland.

Additional information

Competing interests

Authors MK, LW and JW authored one of the studies included in this review. They were not involved in the bias assessment stage of the review. The authors have not received any benefit, in cash or in kind, any hospitality or any subsidy from the alcohol industry or any other source perceived to have an interest in the outcome of this review.

Authors’ contributions

MK led the review. MK and KV designed and conducted the study search. MK and KV undertook study screening, and LW was the third reviewer who discussed issues of disagreement. RH and KV undertook data extraction and risk of bias assessment. MK undertook study synthesis. MK, LW and JW contributed to the conception of the research, and all authors were involved in the preparation of the review, including providing comment on drafts. All authors read and approved the final manuscript.

Additional files

Additional file 1:

Results of database search. This file contains the search strategy and results of the search executed across the databases described in the methods section. The search was undertaken at two time points to ensure all relevant studies were included. (DOCX 200 kb)

Additional file 2:

PRISMA flowchart. This file contains the PRISMA flowchart for the review. The flowchart includes the number of studies screened, number of studies excluded and number of studies included in the review.(PDF 190 kb)

Additional file 3:

Risk of bias assessment: detailed results. This file contains the detailed results of the risk of bias assessment of included studies. The reasons for each assessment rating are provided.(DOCX 21 kb)

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Keywords

  • Alcohol Consumption
  • Sport Club
  • Excessive Alcohol Consumption
  • Club Member
  • Heavy Episodic Drinking

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