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Subject characteristics for the winter and summer cohorts
| Winter (n = 133)a | Summer (n = 33) | |
|---|---|---|
| Age (years) | ||
| 8 | 37 (27) | 15 (42) |
| 9 | 53 (39) | 8 (22) |
| 10 | 43 (32) | 10 (28) |
| Sex | ||
| Boys | 68 (51) | 20 (61) |
| Girls | 65 (49) | 13 (39) |
Figures are n (%)
aTwo children did not return the questionnaire
