Table 1 Comparison of the included and non-included children
Included children (n = 251) | Non-included children (n = 220) | P Value | |
|---|---|---|---|
Statistic | Statistic | ||
Maternal age (yrs), mean ± sd | 32.7 ± 3.8 | 32.3 ± 3.9 | 0.19 |
Parental education level, % graduate | 185 (73.7) | 145 (65.9) | 0.06 |
Maternal smoking during pregnancy, % | 11 (4.8) | 9 (4.6) | 0.91 |
Tobacco smoke exposure*, % | 56 (22.5) | 38 (20.5) | 0.65 |
Maternal parity, % ≥1 children | 145 (57.8) | 112 (50.9) | 0.14 |
Weight at birth (g), mean ± sd | 3352.5 ± 413 | 3213.0 ± 487 | < 0.01 |
Height at birth (cm), mean ± sd | 50.3 ± 2.1 | 49.9 ± 2.5 | 0.03 |
Sex, % male | 136 (54.2) | 115 (52.5) | 0.72 |
Gestation duration ≤ 37 weeks, % | 20 (8.0) | 30 (13.7) | 0.04 |