Table 1.
Demographic characteristics of study subjects
| Age group | H1N1 vaccine | Seasonal influenza vaccine | P | |
|---|---|---|---|---|
| 7·5 μg* | 15 μg* | |||
| Intention‐to‐treat cohort | ||||
| 6–23 months | ||||
| Subjects (N) | 68 | 62 | 37 | |
| Age in months (mean ± SD) | 14·85 ± 5·09 | 14·98 ± 4·82 | 15·05 ± 5·32 | 0·463 |
| Height in cm (mean ± SD) | 75·81 ± 4·88 | 76·53 ± 6·09 | 75·23 ± 9·99 | 0·644 |
| Weight in kg (mean ± SD) | 9·92 ± 1·40 | 9·90 ± 1·46 | 12·39 ± 11·64 | 0·292 |
| Male/female | 39/29 | 28/34 | 20/17 | 0·367 |
| 24–35 months | ||||
| Subjects (N) | 56 | 61 | 26 | |
| Age in months (mean ± SD) | 30·98 ± 3·81 | 30·33 ± 4·16 | 30·76 ± 3·86 | 0·667 |
| Height in cm (Mean ± SD) | 89·30 ± 4·31 | 89·03 ± 4·17 | 86·67 ± 11·19 | 0·175 |
| Weight in kg (mean ± SD) | 13·10 ± 1·54 | 13·13 ± 1·69 | 12·94 ± 1·47 | 0·882 |
| Male/female | 27/29 | 22/39 | 11/15 | 0·413 |
| ATP cohort | ||||
| 6–23 months | ||||
| Subjects (N) | 61 | 54 | 27 | |
| Age in months (mean ± SD) | 14·50 ± 5·08 | 15·00 ± 5·03 | 16·26 ± 4·82 | 0·322 |
| Height in cm (Mean ± SD) | 75·50 ± 5·01 | 76·60 ± 6·37 | 75·56 ± 11·09 | 0·682 |
| Weight in kg (mean ± SD) | 9·89 ± 1·44 | 9·92 ± 1·52 | 12·96 ± 13·49 | 0·318 |
| Male/female | 35/26 | 22/32 | 13/14 | 0·203 |
| 24–35 months | ||||
| Subjects (N) | 55 | 59 | 24 | |
| Age in months (mean ± SD) | 31·02 ± 3·84 | 30·49 ± 4·12 | 30·92 ± 3·98 | 0·766 |
| Height in cm (Mean ± SD) | 89·35 ± 4·33 | 89·04 ± 4·23 | 86·75 ± 11·69 | 0·218 |
| Weight in kg (mean ± SD) | 13·12 ± 1·55 | 13·16 ± 1·71 | 13·04 ± 1·47 | 0·961 |
| Male/female | 27/28 | 22/37 | 11/13 | 0·432 |
SD, standard deviation.
*Infants in 7·5‐μg H1N1 vaccine group received the hemagglutinin (HA) content in a volume of 0·25 ml per vaccination and those in 15‐μg H1N1 vaccine group received the HA content in a volume of 0·5 ml per vaccination.