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Age and gender breakdown of the study population (165 boys and 171 girls).
| Age in years | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SEX | ||||||||||||||
| M | 9 | 8 | 9 | 17 | 14 | 12 | 17 | 18 | 17 | 9 | 10 | 9 | 13 | 3 |
| F | 7* | 12 | 17 | 10 | 11 | 12 | 11 | 15 | 21 | 11 | 11 | 10 | 12 | 11 |
*Includes one girl 4 years 11 months. The ethnic background of the subjects was: 302 Caucasian, 21 African–American, 2 Asian, 3 Hispanic, 1 Native American, 2 Asian/European, and 5 Multi-Ethnic.
