Table 1.
Distribution of 617 589 Norwegian Women With a First Pregnancy During 1980–2009 According to Hypertensive Pregnancy Disorders in the First Pregnancy (Cohort 1)
| No Hypertensive Pregnancy Disorder (n=576 155)a | Hypertensive Pregnancy Disorder (n=41 434) | ||||
|---|---|---|---|---|---|
| GH (n=11 600) | P Valueb | Preeclampsia (n=29 834) | P Valuec | ||
| Mother's age, mean (SD), y | 26.3 (5.0) | 27.4 (5.0) | <0.001 | 26.6 (5.0) | <0.001 |
| Education level | <0.001 | <0.001 | |||
| Basic education, No. (%) | 155 363 (27.0) | 2882 (24.8) | 8123 (27.2) | ||
| Secondary education, No. (%) | 173 290 (30.0) | 3342 (28.8) | 9345 (31.3) | ||
| Tertiary education, No. (%) | 247 502 (43.0) | 5376 (46.3) | 12 366 (41.5) | ||
| Marital status | <0.001 | <0.001 | |||
| Married/cohabitants, No. (%) | 482 982 (83.8) | 10 200 (87.9) | 25 523 (85.5) | ||
| Other, No. (%) | 93 173 (16.2) | 1400 (12.1) | 4311 (14.5) | ||
| Diabetes mellitus, No. (%)d | 2063 (0.4) | 92 (0.8) | <0.001 | 497 (1.7) | <0.001 |
| Maternal complications | <0.001 | 0.001 | |||
| Placental abruption, No. (%) | 2764 (0.5) | 93 (0.8) | 355 (1.2) | ||
| Infant characteristics | |||||
| Preterm delivery, No. (%) | 31 206 (5.4) | 811 (7.0) | <0.001 | 6154 (20.6) | <0.001 |
| SGA infant, No. (%) | 67 968 (11.8) | 1913 (16.5) | <0.001 | 7052 (23.6) | <0.001 |
| Stillbirth, No. (%) | 3339 (0.6) | 91 (0.8) | 0.004 | 220 (0.7) | 0.618 |
| Mode of delivery | <0.001 | <0.001 | |||
| Spontaneous, No. (%) | 486 159 (84.4) | 7467 (64.4) | 11 747 (39.4) | ||
| Induced, No. (%) | 70 563 (12.3) | 3541 (30.5) | 14 353 (48.1) | ||
| Cesarean, No. (%) | 19 433 (3.4) | 592 (5.1) | 3734 (12.5) | ||
Preterm delivery indicates <37 weeks of gestation; SGA, small‐for‐gestational‐age (<10th percentile).
No hypertensive pregnancy disorder indicates no gestational hypertension (GH) or preeclampsia.
P value compares differences among women with no hypertensive pregnancy disorder vs women with GH. Chi‐square test for categorical data and t test for continuous data.
P value compares differences among women with GH vs women with preeclampsia. Chi‐square test for categorical data and t test for continuous data.
Diabetes mellitus (defined as type 1, type 2, or unspecified) diagnosed before the first pregnancy.