Basic characteristics of women for each pregnancy
| Variables . | Pregnancies (N = 376 154 in 280 451 women) . | Percentage . |
|---|---|---|
| Maternal characteristics | ||
| Body mass index | ||
| Normal (18.5-24.9 kg/m2) | 164 883 | 43.8 |
| Underweight (< 18.5 kg/m2) | 12 309 | 3.3 |
| Overweight (25-29.9 kg/m2) | 66 068 | 17.5 |
| Obese (≥30 kg/m2) | 38 101 | 10.2 |
| Missing | 94 793 | 25.2 |
| Cigarette smoking | 88 617 | 23.5 |
| Pregnancy-related characteristics and complication | ||
| Birth outcome | ||
| Live birth | 375 002 | 99.7 |
| Stillbirth | 1152 | 0.3 |
| Mode of delivery | ||
| Spontaneous delivery | 294 426 | 78.3 |
| Caesarean | 58 109 | 15.5 |
| Assisted delivery | 23 619 | 6.3 |
| Previous live births | ||
| None | 213 697 | 56.8 |
| 1 | 116 351 | 30.9 |
| 2 | 33 819 | 8.9 |
| 3 or more | 12 287 | 3.4 |
| Multiple gestation | 6251 | 1.7 |
| Preterm delivery (< 37 wk) | 26 528 | 7.1 |
| Eclampsia/preeclampsia | 1897 | 0.5 |
| Obstetric hemorrhage | 4607 | 1.2 |
| Gestational hypertension | 6294 | 1.7 |
| Gestational diabetes | 2656 | 0.7 |
| Acute respiratory tract infection in pregnancy | 12 980 | 2.4 |
| Urinary tract infection in pregnancy | 30 765 | 8.1 |
| Medical comorbidities | ||
| Preexisting diabetes | 4022 | 1.0 |
| Preexisting hypertension | 11 718 | 3.1 |
| Varicose veins | 8373 | 2.2 |
| Nephrotic syndrome | 214 | 0.06 |
| Systemic lupus erythematosus | 188 | 0.05 |
| Cancer | 5012 | 1.3 |
| Inflammatory bowel disease | 1472 | 0.3 |
| Cardiac disease | 354 | 0.09 |
| Variables . | Pregnancies (N = 376 154 in 280 451 women) . | Percentage . |
|---|---|---|
| Maternal characteristics | ||
| Body mass index | ||
| Normal (18.5-24.9 kg/m2) | 164 883 | 43.8 |
| Underweight (< 18.5 kg/m2) | 12 309 | 3.3 |
| Overweight (25-29.9 kg/m2) | 66 068 | 17.5 |
| Obese (≥30 kg/m2) | 38 101 | 10.2 |
| Missing | 94 793 | 25.2 |
| Cigarette smoking | 88 617 | 23.5 |
| Pregnancy-related characteristics and complication | ||
| Birth outcome | ||
| Live birth | 375 002 | 99.7 |
| Stillbirth | 1152 | 0.3 |
| Mode of delivery | ||
| Spontaneous delivery | 294 426 | 78.3 |
| Caesarean | 58 109 | 15.5 |
| Assisted delivery | 23 619 | 6.3 |
| Previous live births | ||
| None | 213 697 | 56.8 |
| 1 | 116 351 | 30.9 |
| 2 | 33 819 | 8.9 |
| 3 or more | 12 287 | 3.4 |
| Multiple gestation | 6251 | 1.7 |
| Preterm delivery (< 37 wk) | 26 528 | 7.1 |
| Eclampsia/preeclampsia | 1897 | 0.5 |
| Obstetric hemorrhage | 4607 | 1.2 |
| Gestational hypertension | 6294 | 1.7 |
| Gestational diabetes | 2656 | 0.7 |
| Acute respiratory tract infection in pregnancy | 12 980 | 2.4 |
| Urinary tract infection in pregnancy | 30 765 | 8.1 |
| Medical comorbidities | ||
| Preexisting diabetes | 4022 | 1.0 |
| Preexisting hypertension | 11 718 | 3.1 |
| Varicose veins | 8373 | 2.2 |
| Nephrotic syndrome | 214 | 0.06 |
| Systemic lupus erythematosus | 188 | 0.05 |
| Cancer | 5012 | 1.3 |
| Inflammatory bowel disease | 1472 | 0.3 |
| Cardiac disease | 354 | 0.09 |