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Table 3 Characteristics of included cohort studies

From: Assessment of causal link between psychological factors and symptom exacerbation in inflammatory bowel disease: a systematic review utilising Bradford Hill criteria and meta-analysis of prospective cohort studies

First author and year published

Country

Cohort size (n)

Disease

Follow-up in months

Stress exposure

Disease activity

Stats assessment

Strength of association

Bernstein 2010

Canada

552

IBD

12

Major life stress NRS

Perceived stress CPSS

Low positive mood PANAS

High negative mood PANAS

Manitoba

IBD index

OR = 1.69 (1.13,2.54)

OR = 2.63 (1.72,4.01)

OR = 1.42 (0.94,2.15)

OR = 1.73 (1.13,2.66)

Weak

Moderate

Weak

Weak

Duffy 1992

USA

124

IBD

11.5

Major life stress SRE

Daily strains Checklist

Perceived Stress ladder

mCDAI

R = .32, p < .001*

R = .20, p < .05

R = .31, p .001

Moderate

Weak

Moderate

Mardini 2004

USA

18

CD

24

Depression BDI

Anxiety BAI

Hopelessness BHS

Recent Life Change RlCQ

CDAI

β = 5.92 p = .0004

β = 2.42 p = .02

β = 4.87 p = .05

β = 0.08 p = .10

Strong

Strong

Strong

Weak

North 1991

USA

32

IBD

24

Depression CD mBDI

Depression UC mBDI

Recent life events CD SRRS

Recent life events UC SRRS

GSS

β = − 0.03–0.56 (− 0.57–1.05)**

β = − 0.53–1.34 (− 1.84–2.63)

β = 0.17–0.34 (0.32–.75)

β = − 1.47–1.66(− 2.61–4.69)

Strong

Strong***

Moderate

Strong***

Mikocka-Walus 2008

Australia

127

IBD

12

Depression HADS, SCL

Anxiety HADS, SCL

CDAI, SCCAI

OR = 1.003 (0.928–1.085)

OR = 1.057(0.919–1.215)

OR = 1.040 (0.989–1.092)

OR = 0.967(0.841–1.111)

Weak

Weak

Weak

Protective

Mittermaier 2004

Austria

60

IBD

18

Perceived stress V PSQ

Perceived stress G PSQ

Depression BDI

Anxiety STAI

CDAI, CAI

TAUR = 0.1146

R = .0226

R = .2023 p = < .05

R = .1844–.1981 p = < .05

Weak

None

Weak

Weak

Vidal 2006

Spain

155

IBD

11

Recent life events SRRS

IBD activity

index

CDAI/TLWI, HBi

HR = 0.88 (0.68–1.13)

None

Vidal De Lima 2012

Brazil

50

CD

16

Depression and anxiety BDI HADS

CDAI

p = .15

None

Bitton 2008

Canada

87

CD

12

Daily hassle DHS

Perceived stress PSS

Psychological distress

Depression SCL

Anxiety SCL

CDAI

HR = 1.05 (0.95 to 1.15)

HR = 1.2 (0.9 to 1.6)

HR = 1.0(0.85 to 1.2)

HR = 1.6 (0.9 to 2.7)

HR = 1.4 (0.77 to 2.6)

Weak

Weak

Weak

Weak

Weak

Bitton 2003

USA

60

UC

12

Psychological distress

Depression SCL

Anxiety SCL

Perceived stress PSS

Recent stress events PERI

Endoscopygrading scale

HR = 1.038(0.95–1.39)

HR = 1.011 (0.95–1.08)

HR = 1.000 (1.00–1.00)

HR = 0.898 (0.53–1.53)

HR = 1.165 (0.98–1.39)

Weak

Weak

Weak

Weak

None

Duffy 1991

USA

124

IBD

6

Major stress events SRE

Health-related stress

CDAI

RR = 2.6 (1.3–4.9)

RR = 3.8 (1.5–9.9)

Moderate

Strong

Langhorst 2013

Germany

75

UC

12

Perceived stress PSS

Depression and anxiety SCL

CAI

HR = 0.20(0.01–3.31)

HR = 1.05 (1.01–1.10)

HR = 1.08 (0.95–1.22)

None

Weak

Weak

Levenstein 2000

Italy

62

UC

45

Major life stress PLEI

Perceived stress LT PSQ

Depression CES-D

CRP/Rectal biopsy

HR = .73 (0.27–2.0)

HR = 2.8 (1.1–7.2)

HR = 0.99 (0.36–2.7)

None

Strong

None

Camara 2011

Switzerland

468

CD

18

Perceived stress G-PSQ

Anxiety model HADS

Depression model HADS

CDAI

OR = 1.85 (1.43–2.40)

OR = 1.78 (1.38–2.30)

OR = 1.78 (1.38–2.28)

Weak

Weak

Weak

Bernstein 2016

Canada

487

IBD

3

Perceived stress PSS

MIBDI

R = .71–.78 (.52–.88)

Strong

Gaines, 2016

USA

2144

CD

12

Depression PROMIS

SCDAI

t (p = 0.001, df = 2)

Weak

Mikocka-Walus 2016

Switzerland

2007

IBD

108

Depression IBD HADS

Depression CD HADS

Depression UC HADS

Anxiety IBD HADS

Anxiety CD HADS

Anxiety UC HADS

Physician

Assessed

CDAI

MTWAI

p = .000001

p = .0007

p = .005

p = .0014

p = .031

p = .066

Strong

Strong

Strong

Strong

Strong

Weak

Gracie 2018

UK

405

IBD

24 months

Depression HADS

Anxiety HADS

HBI

SCCAI

HR = 0.86; (0.33–2.27)

HR = 2.08 (1.31–3.30)

Weak

Moderate

Kochar 2018

USA

2798

1516

CD

UC

22 months

24 months

Depression PHQ

Depression PHQ

mHBI

SCCAI

RR = 2.3 (1.9–2.8)

RR = 1.3 (0.0–1.7)

Moderate

Weak

  1. NRS numerical rating scale, CPSS Cohen Perceived Stress Scale, PANAS Positive and Negative Affect Schedule, SRE Schedule of Recent Experiences, mCDAI modified Crohn’s disease activity index, BDI Becks Depression Inventory, BAI Becks Anxiety Inventory, BHS Becks Hopelessness Scale, RLCQ Recent Life Change Questionnaire, CDAI Crohn’s disease activity index, mBDI modified Becks Depression Inventory, SRRS stressful life events and hassles, TLWI Truelove-Witts index, GSS gastrointestinal symptom scale, HADS Hospital Depression and Anxiety Scale, SCL Symptom Checklist Scale, SCCAI Simple Clinical Colitis Activity Index, PSQ Perceived Stress Questionnaire, CES-D Center for Epidemiological Studies Depression Scale, CRP clinical rigid proctoscopy, CAI Colitis Activity Index, HBI Harvey-Bradshaw Index, DHS Daily Hassle scale, PSS Perceived Stress Scale, PERI Psychiatric Epidemiology Research Interview, PLEI Paykel Life Experiences Interview, MIBDI Manitoba Inflammatory Bowel Disease Index, PROMIS Patient reported Outcomes Measurement Information System, MTWAI Modified Truelove and Witts Severity Index, PHQ Patient Health Questionnaire, mHBI modified Harvey-Bradshaw index, SCAI Simple Colitis Activity Index. Β regression coefficient, R correlation coefficient
  2. *Correlation coefficient R + 0.30. A weak uphill (positive) linear relationship. + 0.50. A moderate uphill (positive) relationship
  3. **p = .028
  4. ***Some negative associations