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Descriptive characteristics of the sample
| Variable | Mean (SD) | Range | n |
|---|---|---|---|
| Age at induction | 19.6 (1.5) | 16–30 | 6,190 |
| Twin education at enlistment | 12.2 (1.4) | 5–20 | 6,168 |
| Parental education | 11.2 (2.5) | 0–19 | 6,318 |
| AFQT percentile scores at induction | |||
| Raw scores | 55.3 (23.5) | 10–99 | 6,037 |
| Transformed scores | .17 (.71) | −1.29 to 2.32 | 6,037 |
