Table 2 Odds ratio for preeclampsia by reasons for immigration to Norway, 1990–2013
From: Preeclampsia by maternal reasons for immigration: a population-based study
Reasons for immigration | No. of women | With outcome, No. (%) | Crude OR [95% CI] | Adjusted OR [95% CI]a | Adjusted OR [95% CI]b |
|---|---|---|---|---|---|
Preeclampsia (all cases) | |||||
Norwegian women (non-immigrants)c | 1,123,762 | 39,251 (3.5) | 1 | 1 | 1 |
Nordic immigrant women | 22,594 | 723 (3.2) | 0.91 [0.84–0.99] | 0.86 [0.79–0.93] | 0.87 [0.80–0.94] |
Refuge | 29,422 | 800 (2.7) | 0.77 [0.71–0.84] | 0.87 [0.81–0.95] | 0.81 [0.75–0.88] |
Family | 89,523 | 2074 (2.3) | 0.66 [0.62–0.69] | 0.65 [0.62–0.69] | 0.62 [0.59–0.65] |
Labour | 13,618 | 293 (2.2) | 0.61 [0.54–0.68] | 0.56 [0.49–0.63] | 0.55 [0.49–0.62] |
Education | 8351 | 243 (2.9) | 0.83 [0.72–0.95] | 0.75 [0.66–0.86] | 0.75 [0.65–0.86] |
Preterm preeclampsia (< 37 weeks)d | |||||
Norwegian women (non-immigrants)c | 1,077,269 | 8431 (0.8) | 1 | 1 | 1 |
Nordic immigrant women | 21,948 | 157 (0.7) | 0.91 [0.77–1.08] | 0.84 [0.71–1.00] | 0.86 [0.72–1.01] |
Refuge | 28,304 | 257 (0.9) | 1.16 [1.01–1.34] | 1.28 [1.11–1.47] | 1.18 [1.02–1.36] |
Family | 87,571 | 647 (0.7) | 0.94 [0.87–1.03] | 0.93 [0.85–1.02] | 0.88 [0.80–0.96] |
Labour | 13,513 | 68 (0.5) | 0.64 [0.50–0.81] | 0.58 [0.45–0.73] | 0.58 [0.45–0.74] |
Education | 8254 | 64 (0.8) | 0.99 [0.76–1.29] | 0.89 [0.68–1.16] | 0.89 [0.69–1.16] |
Very preterm preeclampsia (< 34 weeks)d | |||||
Norwegian women (non-immigrants)c | 1,077,269 | 3480 (0.3) | 1 | 1 | 1 |
Nordic immigrant women | 21,948 | 57 (0.3) | 0.80 [0.61–1.06] | 0.73 [0.56–0.97] | 0.75 [0.57–0.98] |
Refuge | 28,304 | 132 (0.5) | 1.45 [1.19–1.75] | 1.56 [1.28–1.89] | 1.41 [1.15–1.72] |
Family | 87,571 | 280 (0.3) | 0.99 [0.87–1.13] | 0.98 [0.86–1.12] | 0.91 [0.80–1.05] |
Labour | 13,513 | 32 (0.2) | 0.73 [0.52–1.04] | 0.64 [0.45–0.92] | 0.65 [0.46–0.93] |
Education | 8254 | 30 (0.4) | 1.13 [0.78–1.63] | 0.99 [0.68–1.44] | 1.00 [0.69–1.46] |