Table 2.
Mean age (standard deviations) at puberty events by prepubertal tobacco and alcohol use.
| Body Hair Growth | Voice Change | Facial Hair Growth | ||||
|---|---|---|---|---|---|---|
| n | Mean (sd) | n | Mean (sd) | n | Mean (sd) | |
| Early Alcohol Use | ||||||
| No | 2377 | 11.8 (1.3) | 1837 | 12.4 (1.4) | 1134 | 13.2 (1.8) |
| Yes | 197 | 13.0 (1.7) | 253 | 14.0 (1.7) | 344 | 15.2 (1.7) |
| p-value* | <.001 | <.001 | <.001 | |||
| Early Tobacco Use | ||||||
| No | 2388 | 11.8 (1.3) | 1867 | 12.5 (1.5) | 1177 | 13.4 (2.0) |
| Yes | 186 | 12.7 (1.4) | 223 | 13.6 (1.5) | 301 | 14.8 (1.6) |
| p-value* | <.001 | <.001 | <.001 | |||
*
Differences in mean age at pubertal event were assessed using t-tests with standard errors corrected using heteroscedasticity-consistent covariance matrix estimator that does not assume independent cases within clusters (families).