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# Table 1
**Quality assessment criteria and weighting scheme**

From: Effects of organisational-level interventions at work on employeesâ€™ 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 |