Table 2. Headache frequency according to gender and age.
| Age (yrs) | Headache | |||
|---|---|---|---|---|
| Often | Rarely | |||
| Male (%) | Female (%) | Male (%) | Female (%) | |
| 11 | 30.9 | 21.3 | 29.8 | 37.9 |
| 13 | 36.9 | 36.0 | 34.1 | 35.0 |
| 15 | 32.3 | 42.7 | 36.1 | 27.2 |
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