Table 1. Frequency data for study variables, stress events and infection-related hospitalisations by sex (N = 2141).
| Boys | Girls | ||||
|---|---|---|---|---|---|
| N | Mean | SD | Mean | SD | |
| Maternal age at conception (years) | 2138 | 27.4 | 5.87 | 27.4 | 6.05 |
| Number of stress events in pregnancy | 2141 | 2.3 | 2.09 | 2.3 | 2.06 |
| N | % | N | % | ||
| Timing of stress events (>1 event) | |||||
| No stress events | 468 | 247 | 22.0 | 221 | 21.7 |
| <18 weeks only | 400 | 207 | 18.5 | 193 | 18.9 |
| 18–34 weeks only | 286 | 143 | 12.8 | 143 | 14.0 |
| Both 18 and 34 weeks | 987 | 524 | 46.7 | 463 | 45.4 |
| Maternal Education | |||||
| <High school completion | 1310 | 671 | 59.9 | 639 | 63.0 |
| High school completion | 825 | 450 | 40.1 | 375 | 37.0 |
| Maternal smoking in pregnancy | |||||
| No | 1582 | 838 | 74.8 | 744 | 72.9 |
| Yes | 559 | 283 | 25.2 | 276 | 27.1 |
| N | N | % | N | % | |
| Any infection related hospitalisation | 1089 | 546 | 48.7 | 543 | 53.2 |
| Lower Respiratory Tract Infections | 208 | 112 | 10.0 | 96 | 9.4 |
| Upper Respiratory Tract Infections | 556 | 275 | 24.5 | 281 | 27.5 |
| Gastrointestinal Infections | 180 | 96 | 8.6 | 84 | 8.2 |
| Other Infections (incl.genitourinary, skin and soft tissue and other viral infections) | 241 | 112 | 10.0 | 129 | 12.6 |
*Missing data not included.