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| Study characteristics | ||
| Methods | See Mangtani 2004a. Influenza season 1990 to 1991 | |
| Participants | See Mangtani 2004a | |
| Interventions | See Mangtani 2004a. Vaccine matched the epidemic strain. | |
| Outcomes | See Mangtani 2004a | |
| Notes | See Mangtani 2004a. Epidemic year | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Low risk | A ‐ Adequate |
