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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