Table 1

Criteria list for the assessment of study quality, modified from Lievense et al[15,16]
Item Criteria C/CC/CS
Study population
1 Selection at uniform point C/CC/CS
2 Cases and controls drawn from the same population CC
3 Participation rate >80% for cases/cohort C/CC
4 Participation rate >80% for controls CC
Assessment of risk factor
5 Exposure assessment blinded C/CC/CS
6 Exposure measured identically for cases and controls CC
7 Exposure assessed according to validated measures C/CC/CS
Assessment of outcome
8 Outcome assessed identically in studied population C/CC/CS
9 Outcome reproducibly C/CC/CS
10 Outcome assessed according to validated measures C/CC/CS
Study design
11 Prospective design used C/CC
12 Follow-up time ≥12 months C
13 Withdrawals <20% C
Analysis and data presentation
14 Appropriate analysis techniques used C/CC/CS
15 Adjusted for at least age, and gender C/CC/CS

C = applicable to cohort studies, CC = applicable to case-control studies, CS = applicable to cross-sectional.

Quirk et al.

Quirk et al. BMC Psychiatry 2013 13:175   doi:10.1186/1471-244X-13-175

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