| Bias | Authors' judgement | Support for judgement |
|---|---|---|
| Random sequence generation (selection bias) | Unclear risk | Quote: “.four schools were randomly sampled from the sampling universe of 17 schools” |
| Comment: Insufficient information to permit judgement | ||
| Allocation concealment (selection bias) | Unclear risk | Quote: “.four schools were randomly sampled from the sampling universe of 17 schools” |
| Comment: Insufficient information to permit judgement | ||
| Blinding of participants and personnel (performance bias) | High risk | Quote: “The investigators maintained regular supply of IFA, supervised the distribution and recorded compliance in all the schools.” |
| Comment: not adequately done | ||
| Blinding of outcome assessment (detection bias) | High risk | Quote: “The investigators maintained regular supply of IFA, supervised the distribution and recorded compliance in all the schools.” |
| Comment: not adequately done | ||
| Incomplete outcome data (attrition bias) | High risk | Comment: |
| Group 1: 29/94 | ||
| Group 2: 29/118 | ||
| Group 3: 22/81 | ||
| Group 4: 24/65 | ||
| 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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