Sample characteristics of children and their mothers by gender. GUTS cohort (1996–2003), USA
| Boys | Girls | |
| N (%) | N (%) | |
| 4934 (100.0) | 6043 (100.0) | |
| Age at onset of domestic violence, years | ||
| None | 3756 (76.1) | 4552 (75.3) |
| 0–5 | 901 (18.3) | 1142 (18.9) |
| 6–11 | 277 (5.6) | 349 (5.8) |
| Race/ethnicity | ||
| White | 4609 (93.4) | 5657 (93.6) |
| All others | 325 (6.6) | 386 (6.4) |
| Age at baseline, years | ||
| 9–11 | 2542 (51.5) | 3001 (49.7) |
| 12–14 | 2392 (48.5) | 3042 (50.3) |
| Birth weight, kg | ||
| Less than 2.5 | 175 (3.5) | 242 (4.0) |
| 2.5 to 3.0 | 428 (8.7) | 741 (12.3) |
| 3.0 to 3.5 | 1507 (30.5) | 2343 (38.8) |
| 3.5 to 4.0 | 1835 (37.2) | 1962 (32.5) |
| 4.0 to 4.5 | 760 (15.4) | 581 (9.6) |
| More than 4.5 | 179 (3.6) | 102 (1.7) |
| Maternal BMI before pregnancy | ||
| Under weight (<18.5) | 270 (5.5) | 318 (5.3) |
| Normal weight (18.5–24.9) | 3496 (70.9) | 4168 (69.0) |
| Overweight (25.0–29.9) | 473 (9.6) | 607 (10.0) |
| Obese (≥30.0) | 158 (3.2) | 203 (3.4) |
| Household parental income, US$ | ||
| ≥50 000 | 3719 (75.4) | 4491 (74.3) |
| <50 000 | 529 (10.7) | 663 (11.0) |
| Missing information | 686 (13.9) | 889 (14.7) |
BMI, body mass index; GUTS, Growing Up Today Study.