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Table 1 Quality assessment criteria and weighting scheme

From: Effects of organisational-level interventions at work on employees’ health: a systematic review

Criteria Rationale Weights
Is there a control group? Reduction of bias of the estimates of intervention effects 0 or 1
Is the baseline response greater than 70% Reduction of sampling bias 0 or 1
Is the follow-up response greater than 50% Reduction of attrition and turnover bias 0 or 1
Have the authors adjusted for non-response and drop-out? Reduction of bias of the estimates of intervention effects by adjusting for attrition and turnover bias 0 or 1
Is there adequate adjustment for the majority of known confounders? Reduction of bias of the estimates of intervention effects by adjusting for relevant confounders 0 or 1
Where appropriate statistical tests used? Reduction of bias of the estimates of intervention effects by using appropriate statistical methods 0 or 1
Sample size at baseline. 0 if n is in 1st quantile, 2 if n is in the 2nd quantile, 3 if n is in the 3rd quantile Validity of statistical inference 0 to 3
Sample size at follow-up. 0 if n is in 1st quantile, 2 if n is in the 2nd quantile, 3 if n is in the 3rd quantile. Validity of statistical inference 0 to 3