Table 1.
Frequency distribution of the predictor variable (N stress events during pregnancy) and covariates (other factors) for male and female offspring.
| Continuous variables | Males | Females | ||||
|---|---|---|---|---|---|---|
| n | M | SD | n | M | SD | |
| Maternal age at conception (years) | 913 | 28.15 | 5.63 | 833 | 27.96 | 5.75 |
| Gestational age at delivery (weeks) | 888 | 39.40 | 2.62 | 808 | 39.37 | 1.98 |
| N stress events during pregnancy | 913 | 1.80 | 1.80 | 833 | 1.87 | 1.83 |
| Proportion of optimal birth weight (%) | 912 | 97.52 | 12.71 | 829 | 97.31 | 12.44 |
| 5 min Apgar scores | 913 | 9.10 | 3.06 | 831 | 9.05 | 0.71 |
| Baby blues symptoms | 786 | 2.96 | 2.95 | 729 | 2.93 | 3.05 |
| Categorical variables | N | n | % | N | n | % |
|---|---|---|---|---|---|---|
| Maternal education at pregnancy | 913 | 833 | ||||
| Completed secondary school | 393 | 43.00 | 349 | 41.90 | ||
| Did not complete secondary school | 520 | 57.00 | 484 | 58.10 | ||
| Smoking in pregnancy | 913 | 833 | ||||
| None | 714 | 78.20 | 637 | 76.50 | ||
| 1–10 cigarettes daily | 99 | 10.80 | 100 | 12.00 | ||
| 11+ cigarettes daily | 100 | 11.00 | 96 | 11.50 | ||
| Alcohol consumption during pregnancy | 913 | 833 | ||||
| None | 534 | 58.50 | 519 | 62.30 | ||
| Once a week or less | 327 | 35.80 | 264 | 31.70 | ||
| Several times a week or more | 52 | 5.70 | 50 | 6.00 | ||
| Family income during pregnancy | 888 | 793 | ||||
| ≥$24,000 | 550 | 61.90 | 481 | 60.70 | ||
| <$24,000 | 338 | 38.10 | 312 | 39.30 | ||
| Biological father living with family during pregnancy | 904 | 829 | ||||
| Yes | 832 | 92.00 | 733 | 88.40 | ||
| No | 72 | 8.00 | 96 | 11.60 | ||
| Parity | 913 | 833 | ||||
| 0 | 416 | 45.60 | 418 | 50.20 | ||
| 1 | 287 | 31.40 | 235 | 28.20 | ||
| >1 | 210 | 23.00 | 180 | 21.60 |