Table 1. Characteristics in the second generation (G2) pregnancy by first generation (G1) smoking.
Numbers are shown in n and (%).
| G1 Non-smoking | G1 Smoking | |
|---|---|---|
| Women total | n = 95,763 | n = 58,122 |
| Age at childbirth (yrs) | ||
| <20 | 6,339 (6.6) | 5,837 (10.0) |
| 20–29 | 88,649 (92.6) | 51,997 (89.5) |
| 30–39 | 775 (0.8) | 288 (0.5) |
| Body mass index (kg/m 2 ) | ||
| <18.5 | 3,389 (3.5) | 1,838 (3.2) |
| 18.5–24.9 | 59,043 (61.7) | 31,386 (54.0) |
| 25–29.9 | 22,112 (23.1) | 15,015 (25.8) |
| 30–34.9 | 7,907 (8.3) | 6,549 (11.3) |
| 35–39.9 | 2,419 (2.5) | 2,399 (4.1) |
| ≥40 | 893 (0.9) | 935 (1.6) |
| Parity | ||
| 1 | 65,904 (68.8) | 38,088 (65.5) |
| 2 | 25,425 (26.5) | 16,454 (28.3) |
| ≥3 | 4,434 (4.6) | 3,580 (6.2) |
| Number in birth | ||
| Singleton | 93,962 (98.1) | 56,952 (98.0) |
| Twins/multiple | 1,801 (1.9) | 1,170 (2.0) |
| Smoking during pregnancy | ||
| Non-smoker | 88,214 (92.1) | 45,086 (77.6) |
| 1–9 cigarettes/day | 6,359 (6.6) | 10,229 (17.6) |
| >9 cigarettes/day | 1,190 (1.2) | 2,807 (4.8) |
| Preeclampsia a | ||
| Mild | 2,458 (2.6) | 1,535 (2.6) |
| Severe | 1,075 (1.1) | 653 (1.1) |
| Hypertension | ||
| Chronic | 165 (0.2) | 95 (0.2) |
| Pregnancy-induced | 1,091 (1.1) | 682 (1.2) |
| Gestational diabetes | 445 (0.5) | 440 (0.8) |
| Non-gestational diabetes b | 610 (0.6) | 309 (0.5) |
aMild preeclampsia was defined as a diastolic blood pressure of 90–109 mmHg combined with proteinuria of <5 g/day and severe preeclampsia as either a diastolic blood pressure of ≥110 mmHg or proteinuria of ≥5 g/day or both.
bIncludes both type 1 and type 2 diabetes as the Swedish Medical Birth Register does not distinguish between the two types.