| Bias | Authors' judgement | Support for judgement |
|---|---|---|
| Random sequence generation (selection bias) | Unclear risk | Quote: “The 9 schools were randomly assigned to 3 study groups” |
| Comment: Insufficient information to permit judgement | ||
| Allocation concealment (selection bias) | Unclear risk | Quote: “The 9 schools were randomly assigned to 3 study groups” |
| Comment: Insufficient information to permit judgement | ||
| Blinding of participants and personnel (performance bias) | Low risk | Quote: “Each milk supplement was supplied in colour‐coded UHT cartons with the identity of the supplement being unknown to both subjects and investigators during the course of the study.” |
| Comment: Adequately done | ||
| Blinding of outcome assessment (detection bias) | Low risk | Quote: “Each milk supplement was supplied in colour‐coded UHT cartons with the identity of the supplement being unknown to both subjects and investigators during the course of the study.” |
| Comment: Adequately done | ||
| Incomplete outcome data (attrition bias) | Low risk | Comment: |
| Group 1:29/238 loss to follow‐up | ||
| Group 2: 18/260 loss to follow‐up | ||
| Group 3: 12/259 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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