Table 1.
Socio-demographic characteristics of the 3359 women in the cohort at first birth who contributed more births in the study
| Maternal characteristics (1st pregnancy) | Outcome in the 1st (or first recorded) pregnancy | ||
|---|---|---|---|
| Term birth (≥37 weeks) | Preterm birth (<37 weeks) | P-value* | |
| Education level | 0.004 | ||
| ≤12 | 1853 | 339 (15.5) | |
| 12+ | 1019 | 140 (12.1) | |
| Body mass index† | <0.001 | ||
| Underweight (<18.5 kg/m2) | 389 | 92 (20.4) | |
| Normal (18.5–24.9 kg/m2) | 262 | 28 (9.6) | |
| Overweight (25.0–29.9 kg/m2) | 228 | 22 (8.8) | |
| Obese (≥30 kg/m2) | 151 | 18 (10.7) | |
| Number of ANC visits | <0.001 | ||
| <5 | 1596 | 363 (22.7) | |
| ≥5 | 1284 | 116 (8.3) | |
| Maternal infections | 0.64 | ||
| Yes | 1212 | 207 (14.6) | |
| No | 1668 | 272 (14.0) | |
| Pre-eclampsia | <0.001 | ||
| Yes | 78 | 42 (35.0) | |
| No | 2802 | 437 (13.5) | |
| Induced labour | 0.01 | ||
| Yes | 1124 | 158 (12.3) | |
| No | 1.756 | 321 (15.5) | |
| Caesarean section | <0.001 | ||
| Yes | 873 | 200 (18.6) | |
| No | 2007 | 279 (13.4) | |
| Low birth weight | <0.001 | ||
| Yes | 338 | 243 (41.8) | |
| No | 2542 | 236 (8.5) | |
| Perinatal death | <0.001 | ||
| Yes | 137 | 95 (40.9) | |
| No | 2743 | 384 (12.3) | |
| Maternal age: mean (SD) | 26.0 (4.9) | 25.7 (5.3) | 0.24 |
| All women | 2880 | 479 (14.3%) | |
SD, Standard deviation.
*
Chi-square tests for heterogeneity except of a t-test for mean maternal age.
†
Numbers do not add to total because of missing values in the BMI variables.