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Table 1 Characteristics of the systematic reviews included

From: Prognostic factors for persistent symptoms in adults with mild traumatic brain injury: an overview of systematic reviews

Authors, year of publication

Nb of primary articles retained for the OvSR

Design of the studies included

Population

Purpose of the review

ROBIS assessment

Begaz et al., 2006 [44]

7/11

Prospective cohort studies

Adults with mTBI

Assess the predictive ability and potential clinical utility of known serum biochemical markers on the outcome of PCS in patients with closed head injury and mild TBI

HR

Belanger et al., 2005 [45]

39/39

Not specified

Adults and adolescents with mTBI

Determine the magnitude of impairment in mTBI participants across multiple cognitive domains

HR

Belanger et al., 2010 [46]

8/8

Not specified

Adult and adolescent athletes with mTBI

Determine the magnitude of impairment in those participants with multiple concussions across multiple cognitive domains

HR

Biagianti et al., 2020 [47]

9/9

Longitudinal cohort and case-control studies

Adults with mTBI

Integrate findings from longitudinal studies that investigated across the spectrum of neuroimaging modalities the changes within the first twelve months following a mTBI, with the goal of identifying possible predictors or biomarkers of persistent PCS

HR

Boyle et al., 2014 [17]

3/3

Retrospective cohort studies

Military with mTBI

Synthesize the best available evidence on the course and prognosis of mTBI in the military population

LR

Cancelliere et al., 2014 [48]

4/4

Cohort studies

Workers with mTBI

Synthesize the best available evidence on RTW after mTBI

LR

Cancelliere et al., 2016 [18]

12/16

Control trials, cohort, and case-control studies

Adults and children with mTBI

Determine sex differences in the recovery and prognosis after mTBI in adults and children

HR

Carroll et al., 2004 [19]

53/120a

Cohort studies, randomized control trials, systematic reviews, cross-sectional studies, and case series or variant designs

Adults and children with mTBI

Produce a best-evidence synthesis on the epidemiology (incidence, risk, and prevention), diagnosis, treatment, and prognosis of mTBI

LR

Carroll et al., 2014 [5]

20/21

Randomized control trials, cohort, and case-control studies

Adults with mTBI

Synthesize the best available evidence on objective outcomes after adult mTBI

LR

Cassidy et al., 2014 [2]

20/23

Cohort and non-randomized experimental studies

Adults with mTBI (excluding sport/military injuries)

Update the WHO findings on course and prognosis in adults with respect to self-reported outcomes

LR

Finkbeiner et al., 2016 [49]

15/23

Retrospective studies and qualitative studies

Adult athletes with concussion

Summarize the current literature addressing chronic (> 3 months) psychiatric changes, including emotional and behavioral domains (depression, anxiety, substance abuse, and challenging behaviors) with sport concussion in adults

HR

Godbolt et al., 2014 [22]

2/8

Cohort studies and randomized control trials

Adults and children with mTBI

Synthesize the best available evidence regarding the risk of dementia and chronic cognitive impairment after mTBI

LR

Khong et al., (2016) [50]

9/10

Case-control

Adults and children with mTBI

Review the evidence for the use of DTI parameters in the human brain as a diagnostic tool for and predictor of PCS after a mTBI

HR

King, 2014a [24]

20/20

Retrospective studies, prevalence studies of risk factors, and outcome with/without matched controls

Adults with mTBI (16–65 years old)

Review the studies which have examined working age mTBI patients at 18+ months post-injury and examined the relationship between age or gender and permanent PCS

HR

King, 2014b [25]

16/16

Prevalence, prospective follow-up, explorative follow-up, and epidemiological studies

Adults with mTBI (16–65 years old)

Systematically review the literature to identify and examine those studies which have investigated working-age patients with prolonged PCS (i.e., at 12–18 months post-injury)

HR

Ludwig et al., 2020 [51]

2/4

Prospective longitudinal study and longitudinal cohort study

> 16 years old individuals with mTBI

Examine the association between sleep during the acute stage (< 2 weeks) of a concussion and long-term post-concussive outcomes

LR

Manley et al., 2017 [52]

47/47

Retrospective, case series, case-control, cross-sectional, cross-sectional surveys, cohort studies, and surveys

Adults with sport-related concussion

Address the current state of the scientific evidence about the prevalence, risk factors, and causation of possible long-term sequelae like chronic traumatic encephalopathy and other neurodegenerative diseases, with respect to sports concussion

LR

Mercier et al., 2018a [27]

21/29

Retrospective, prospective cohort studies, and randomized control trials

Adults with mTBI

Determine the prognostic value of S-100b protein to identify patients with post-concussion symptoms after a mTBI

LR

Mercier et al., 2018b [26]

7/10

Cohort studies

Adults with mTBI

Determine the prognostic value of neuron-specific enolase to predict post-concussion symptoms following mTBI

LR

Merritt et al., 2019 [53]

10/37

Cross-sectional, epidemiology, repeated measures, retrospective and case series studies, systematic review, and meta-analysis

Adults with mTBI

Examine sex differences in concussion, or mTBI outcome, updating previous critical reviews of the literature

HR

Ofoghi et al., 2020 [54]

14/19

Retrospective or prospective, observational, case-cohort, cohort, non-randomized studies

Individuals with mTBI

Evaluated the current literature examining the structural and functional neuroimaging correlates and pain processing network differences that could contribute to the persistence of pain following mTBI

HR

Puig et al., 2020 [55]

10/14

Prospective or retrospective cohort studies

Individuals > 16 years old with mTBI

Evaluate the current literature examining the use of MRI-based brain-connectivity mapping techniques including DTI and/or rs-fMRI to predict clinical outcomes following acute mTBI

LR

Silverberg et al., 2015 [56]

18/26

Prospective inception cohort studies

Adults and children with mTBI

Identify and evaluate multivariable prognostic models for mTBI and determine which pre-, peri-, and early post-injury variables have independent prognostic value in the context of multivariable models

LR

Sullivan et al., 2016 [57]

4/5

Cohort and cross-sectional studies

Adults with mTBI

Determine how the term resilience has been used in adult mTBI research

HR

Zhu et al., 2019 [58]

6/9

Cohort and case-control studies

Adults with mTBI

Explore the association between DTI findings and cognitive function following mTBI using a meta-analysis

HR

  1. DTI diffusion tensor imaging, HR high risk, LR low risk, MRI magnetic resonance imaging, PCS postconcussion symptoms, rs-fMRI resting-state functional magnetic resonance imaging, RTW return to work, WHO World Health Organization
  2. aThis review does not present the results of all articles included