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Participant characteristics
| Characteristics | Cohort A (n = 710) | Cohort B (n = 880) | Cohort C (n = 402) |
|---|---|---|---|
| Mean age, years (standard deviation) | 1·84 (0·74) | 5·54 (1·66) | 12·64 (2·48) |
| Female sex, n (%) | 45·8 (325) | 49·9 (439) | 50·2 (202) |
| Previous receipt of any influenza vaccination, n (%) | 10·0 (71) | 29·5 (260) | 22·6 (91) |
| Receipt of influenza vaccine prior to 2008, n (%) | 3·2 (23) | 20·1 (177) | 16·2 (65) |
| Receipt of influenza vaccine during 2008, n (%) | 8·6 (61) | 17·4 (153) | 13·4 (54) |
