| Smoking | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Boys (n = 94,793) | P value | Girls (n = 99,466) | P value | |||||||
| Yes | No | Yes | No | |||||||
| N | % | N | % | N | % | N | % | |||
| Total (n = 194,259) | 18,014 | (19.0) | 76,779 | (81.0) | 6498 | (6.5) | 92,968 | (93.5) | ||
| Smoking exposure at home | < 0.0001 | < 0.0001 | ||||||||
| Yes | 5935 | (24.6) | 18,230 | (75.4) | 2619 | (9.6) | 24,736 | (90.4) | ||
| No | 12,079 | (17.1) | 58,549 | (82.9) | 3879 | (5.4) | 68,232 | (94.6) | ||
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