Demographic data of the children (n=582)
| Class in school | 1 st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
| Participants (n) | 84 | 81 | 82 | 73 | 80 | 69 | 55 | 58 |
| Previous first aid course (n) | 6 | 5 | 14 | 10 | 12 | 20 | 2 | 6 |
| Mean age (years) | 7 (7–8) | 8 (8–9) | 9 (9–10) | 10 (10–11) | 11 (11–12) | 12 (12–13) | 13 (13–14) | 14 (14–15) |
| Mean body weight (kg) | 27 (17–45) | 31 (19–47) | 30 (20–47) | 36 (25–46) | 42 (26–60) | 45 (30–65) | 50 (33–70) | 59 (35–76) |
| Mean body height (cm) | 128 (120–156) | 135 (122–155) | 139 (124–156) | 145 (140–159) | 153 (140–165) | 157 (140–178) | 163 (145–179) | 169 (144–184) |
| Mean body mass index | 16 (11–19.2) | 17 (11–19) | 16 (11.8–23) | 17 (12–19.7) | 18 (12–23.6) | 18 (13.3–23) | 19 (15–23.1) | 21 (15.7–25) |
Range give in parentheses. Data are normally distributed.