| Bias | Authors' judgement | Support for judgement |
|---|---|---|
| Random sequence generation (selection bias) | Unclear risk | Quote: “.and allocated randomly to placebo or weekly groups.” |
| Comment: Insufficient information to permit judgement | ||
| Allocation concealment (selection bias) | Unclear risk | Quote: “One hundred of them were recruited from one school and allocated randomly to placebo or weekly groups. The other 50 students were recruited at random from a different junior high school and allocated to the menstruation group.” |
| Comment: Insufficient information to permit judgement | ||
| Blinding of participants and personnel (performance bias) | Low risk | Quote: “This single blind community experimental study.” |
| Comment: Adequately done | ||
| Blinding of outcome assessment (detection bias) | High risk | Quote: “This single blind community experimental study.” |
| Comment: Not done | ||
| Incomplete outcome data (attrition bias) | Low risk | Comment: |
| Group 1: 2/50 loss to follow‐up | ||
| Group 2: 9/50 loss to follow‐up | ||
| Group 3: 2/50 loss to follow‐up | ||
| Selective reporting (reporting bias) | Unclear risk | Comment: Trial registration not reported. Outcomes specified in the methodology section were reported |
| Other bias | Low risk | Comment: No other biases detected |
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