Table 1. Distribution of participants by age and season.
| Age group (years) | Summer (n) | Winter (n) |
| 0 | 20 | 20 |
| 1 | 19 | 15 |
| 2 | 8 | 11 |
| 3 | 13 | 7 |
| 4 | 13 | 13 |
| 5–6 | 12 | 13 |
| Total | 85 | 79 |
| Women in their 20s (control group) | 15 | 15 |
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