Table 1.
Characteristics of 506 350 Norwegian Women With 1 to 5 Singleton Deliveries and a First Delivery During 1980–2002, by Parity and Presence of Preeclampsia
| Characteristics of the Study Participants | One Lifetime Pregnancy | More than 1 Lifetime Pregnancy | ||
|---|---|---|---|---|
| Without Preeclampsia (n=86 180) | With Preeclampsia (n=4385) | Without Preeclampsia (n=390 253) | With Preeclampsiaa (n=25 532) | |
| Age at first birth, mean (SD), y | 27.5 (5.7) | 28.1 (5.6) | 25.1 (4.2) | 25.0 (4.2) |
| Education level, No. (%)b | ||||
| Basic education | 30 727 (35.7) | 1661 (37.9) | 113 396 (29.1) | 7531 (29.5) |
| Secondary education | 24 162 (28.0) | 1329 (30.3) | 118 591 (30.4) | 7998 (31.3) |
| Tertiary education | 28 747 (33.4) | 1333 (30.4) | 155 756 (39.9) | 9877 (38.7) |
| Marital status at first birth, No. (%)c | ||||
| Married/cohabitant | 62 303 (72.3) | 3419 (78.0) | 325 468 (83.4) | 64 785 (16.6) |
| Other | 23 877 (27.7) | 966 (22.0) | 21 525 (84.3) | 4007 (15.7) |
| Diabetes mellitus, No. (%)d | 401 (0.5) | 117 (2.7) | 944 (0.2) | 265 (1.0) |
| Preterm delivery, No. (%)e | 5292 (6.1) | 1080 (24.6) | 35 714 (9.2) | 6485 (25.4) |
| Small for gestational age, No. (%)f | 11 487 (13.3) | 1221 (27.8) | 65 691 (16.8) | 7631 (29.9) |
| Study end points, No. (%) | ||||
| Major coronary event | 352 (0.4) | 55 (1.3) | 743 (0.2) | 125 (0.5) |
| Cardiovascular deaths | 171 (0.2) | 21 (0.5) | 256 (0.1) | 20 (0.1) |
| All deaths | 2034 (2.4) | 109 (2.5) | 3065 (0.8) | 203 (0.6) |
| Follow‐up time until major coronary event, median (IQR), y | 17.2 (11.3) | 15.9 (11.7) | 18.5 (10.8) | 17.8 (11.0) |
| Follow‐up time until cardiovascular death, median (IQR), y | 17.2 (11.3) | 15.7 (11.6) | 18.5 (10.8) | 17.8 (11.0) |
IQR indicates interquartile range.
a
In at least 1 of the pregnancies.
b
Information on education was not available in 5242 (1.04%) of women .
c
Information on cohabitant only available from 1982.
d
Diabetes mellitus diagnosed before the first pregnancy.
e
Less than 37 weeks of gestation.
f
Lower than the 10th percentile.