Table 1. Patient characteristics.
| 2D/4D (+) | 2D/4D (-) | |||||
|---|---|---|---|---|---|---|
| n | Mean ± SD | n | Mean ± SD | |||
| Maternal characteristics | ||||||
| Age at delivery (years old) | 189 | 31.4 ± 4.2 | 315 | 30.7 ± 5.2 | ** | |
| Pre-pregnancy BMI (m2/kg) | 189 | 21.0 ± 3.1 | 315 | 21.6 ± 3.4 | ||
| Parity | Primiparous | 92 (48.7) | 148 (47.0) | |||
| Multiparous | 97 (51.3) | 167 (53.0) | ||||
| Annual house hold income (million yen per year) | <5 | 108 (57.1) | 237 (75.2) | ** | ||
| ≥5 | 81 (42.9) | 78 (24.8) | ||||
| Educational level (years) | ≤12 | 58 (30.7) | 166 (52.7) | ** | ||
| ≥13 | 131 (69.3) | 149 (47.3) | ||||
| Smoking during pregnancy | Nonsmoker | 174 (92.1) | 232 (73.7) | ** | ||
| Smoker | 12 (7.9) | 83 (26.3) | ||||
| Alcohol consumption during pregnancy | Nondrinker | 120 (63.5) | 235 (74.6) | |||
| Drinker | 69 (36.5) | 80 (25.4) | ||||
| Infant characteristics | ||||||
| Gender | Males | 88 (46.3) | 158 (49.2) | |||
| Females | 102 (53.7) | 163 (50.8) | ||||
| Birth weight (g) | 190 | 3037.6 ± 379.7 | 321 | 3003.9 ± 444.5 | ||
| Gestational age (weeks) | 190 | 38.9 ± 1.5 | 321 | 38.6 ± 1.6 | ||
The values in brackets represent percentages.
**: p<0.01.