Table I.
Age means and ranges in years and the number of observations of each sexual maturation stage for participants – Project HeartBeat!
| Sexual maturation ratings |
|||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| Nonblack males | |||||
| Age mean (SD) | 9.17 (1.3) | 11.54 (1.12) | 13.26 (1.06) | 14.11 (0.80) | 14.69 (0.91) |
| Age range | 8.13-12.02 | 8.48-14.81 | 10.42-15.43 | 11.76-15.75 | 11.22-16.57 |
| N of observations | 884 | 362 | 168 | 153 | 490 |
| Black males | |||||
| Age mean (SD) | 9.30 (1.02) | 11.19 (1.38) | 12.11 (0.48) | 14.02 (0.87) | 14.46 (0.75) |
| Age range | 8.28-11.74 | 8.96-13.05 | 11.71-12.77 | 12.45-14.94 | 13.46-15.53 |
| N of observations | 192 | 106 | 40 | 28 | 53 |
| Nonblack females | |||||
| Age mean (SD) | 8.79 (0.98) | 10.81 (0.94) | 12.44 (1.21) | 13.35 (1.26) | 14.43 (1.04) |
| Age range | 8.13-12.15 | 8.36-13.01 | 10.14-14.78 | 10.49-15.72 | 11.61-17.31 |
| N of observations | 672 | 423 | 225 | 213 | 569 |
| Black females | |||||
| Age mean (SD) | 8.80 (0.36) | 9.99 (1.25) | 11.72 (1.68) | 11.95 (0.83) | 14.05 (1.72) |
| Age range | 8.16-9.51 | 8.22-12.96 | 9.54-14.16 | 10.95-12.89 | 10.87-16.05 |
| N of observations | 100 | 120 | 77 | 44 | 158 |
N, number.