Table 1.
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 |
Crockett Pubertal Development Scale; values range from 1 to 5, with larger values referring to more advanced pubertal development.
Hollingshead Index of Social Position; larger values indicate lower socioeconomic status (middle class corresponds to 32–47 range); parent-rated.
Wechsler Abbreviated Scale of Intelligence (2-subtest version).
Impulsive Sensation Seeking scale from Zuckerman-Kuhlman Personality Questionnaire.
Children’s Sleep Habits Questionnaire.
Root mean square; index of averaged within-run motion.
Statistical significance at p < 0.001.