Table 1.
Descriptive statistics by pubertal timing and racial group in 264 adolescent girls
| Pubertal timing group |
Racial group |
||||
| Early | On-time | Late | White | Black | |
| n | 39 | 175 | 45 | 164 | 100 |
| Mean age in years (SD) | 15.27 (2.06) | 14.79 (2.16) | 15.59 (2.09) | 14.82 (2.23) | 15.12 (2.10) |
| Mean SES (SD) | 37.5 (13.0) | 36.71 (14.11) | 40.02 (11.34) | 40.71 (13.59) | 31.86 (11.86) |
| Mean age at menarche in years (SD) | 10.56 (0.93) | 12.39 (0.70) | 14.17 (0.53) | 12.64 (1.11) | 11.99 (1.34) |
| Percent White | 64.1 | 60.6 | 68.9 | ||
| Percent that have never smoked | 35.9 | 43.4 | 37.8 | 42.4 | 41.4 |
| Percent that had friends who smoke | 35.9 | 34.3 | 44.4 | 37 | 34.3 |
| Percent that had parents who smoke | 43.6 | 45.7 | 44.4 | 40.9 | 53 |
Note. SES = socioeconomic status. For the White group, the cutoffs for the early and late groups were 11.52 and 13.74 years, respectively, whereas for the Black group, the cutoffs were 10.67 and 13.34 years, respectively.