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Chi-square test of timing of puberty between boys and girls
| Boys (n = 441) | Girls (n = 407) | χ2 | P | |
|---|---|---|---|---|
| Early puberty | 56 (12.7%) | 80 (19.7%) | 7.609 | 0.007 |
| On-time puberty | 310 (70.3%) | 155 (38%) | 88.673 | <0.001 |
| Delayed puberty | 75 (17.0%) | 172 (42.3%) | 65.389 | <0.001 |
