Table 1.
Demographic and behavioral measures.
| Boys (n = 96) | Girls (n = 71) | Statistic | |
|---|---|---|---|
| Age (years) | 14.2 (1.3) | 14.4 (1.3) | t165 = 0.63 |
| Range | 12.3–17.0 | 12.0–16.9 | |
| Pubertya | 3.1 (0.9) | 4.0 (0.6) | Z = 6.45** |
| Socioeconomic statusb | 29.9 (13.5) | 30.5 (14.6) | t165 = 0.28 |
| IQc | 110.3 (12.4) | 110.8 (10.0) | t165 = 0.31 |
| Log Testosterone (ng/dL) | 2.3 (0.5) | 1.2 (0.3) | t153.37 = 20.68** |
| Range | 7.1–809.5 | 2.4–53.3 | |
| Log Estradiol (pg/dL) | 1.2 (0.2) | 1.5 (0.2) | t162.76 = 11.12** |
| Range | 6.1–38.0 | 11.9–85.0 | |
| Sensation Seekingd | 42.5 (21.0) | 42.8 (22.0) | t165 = 0.09 |
| CHSQ Sleepinesse | 5.8 (1.7) | 6.2 (1.9) | t165 = 1.24 |
| RMS head movementf | 0.31 | 0.27 | t165 = 1.19 |
a
Crockett Pubertal Development Scale; values range from 1 to 5, with larger values referring to more advanced pubertal development.
b
Hollingshead Index of Social Position; larger values indicate lower socioeconomic status (middle class corresponds to 32–47 range); parent-rated.
c
Wechsler Abbreviated Scale of Intelligence (2-subtest version).
d
Impulsive Sensation Seeking scale from Zuckerman-Kuhlman Personality Questionnaire.
e
Children’s Sleep Habits Questionnaire.
f
Root mean square; index of averaged within-run motion.
**
Statistical significance at p < 0.001.