| Primiparous | Multiparous | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
n | Stillbirths | (%) | Crude OR (95% CI) | Adjusteda OR (95% CI) | n | Stillbirths | (%) | Crude OR (95% CI) | Adjustedb OR (95% CI) | |
Paternal origin | ||||||||||
 Foreign-born (ref) | 47,109 | 233 | (0.5) | 1.00 | 1.00 | 73,487 | 313 | (0.4) | 1.00 | 1.00 |
 Norwegian-born | 30,175 | 119 | (0.4) | 0.80 (0.63 to 1.00) | 0.73 (0.58 to 0.93) | 31,643 | 106 | (0.3) | 0.79 (0.63 to 0.98) | 0.83 (0.65 to 1.05) |
 Missing c | 4029 | 90 | (2.2) | 4.60 (3.59 to 5.89) | 6.29 (4.64 to 8.51) | 12,077 | 247 | (2.0) | 4.88 (4.12 to 5.79) | 5.72 (4.70 to 6.96) |
Reason for immigration d | ||||||||||
 Nordic migrants (ref) |  | 56 | (0.6) | 1.00 | 1.00 | 9145 | 37 | (0.4) | 1.00 | 1.00 |
 Work/Education | 13,410 | 46 | (0.3) | 0.54 (0.36 to 0.80) | 0.58 (0.39 to 0.88) | 9057 | 38 | (0.4) | 1.04 (0.66 to 1.64) | 1.21 (0.76 to 1.92) |
 Family reunion or establishment | 38,083 | 196 | (0.5) | 0.81 (0.60 to 1.09) | 0.76 (0.55 to 1.06) | 53,209 | 281 | (0.5) | 1.31 (0.92 to 1.86) | 1.22 (0.85 to 1.74) |
 Refuge | 9467 | 62 | (0.7) | 1.03 (0.71 to 1.48) | 0.92 (0.62 to 1.37) | 20,623 | 138 | (0.7) | 1.66 (1.14 to 2.41) | 1.41 (0.95 to 2.11) |
Length of residence | ||||||||||
 < 2 years (ref) | 30,801 | 148 | (0.5) | 1.00 | 1.00 | 18,029 | 99 | (0.5) | 1.00 | 1.00 |
 2–5 years | 28,095 | 158 | (0.6) | 1.17 (0.93 to 1.47) | 1.20 (0.94 to 1.53) | 42,549 | 221 | (0.5) | 0.95 (0.75 to 1.20) | 0.97 (0.76 to 1.24) |
 6–9 years | 10,299 | 64 | (0.6) | 1.30 (0.96 to 1.75) | 1.28 (0.93 to 1.77) | 27,294 | 160 | (0.6) | 1.07 (0.83 to 1.37) | 1.04 (0.80 to 1.36) |
 ≥ 10 years | 12,118 | 72 | (0.6) | 1.24 (0.93 to 1.65) | 1.27 (0.93 to 1.74) | 29,335 | 186 | (0.6) | 1.16 (0.90 to 1.48) | 1.06 (0.81 to 1.39) |
Birthplace of firstborn child | ||||||||||
 Norway (ref) |  |  |  |  |  | 52,834 | 231 | (0.4) | 1.00 | 1.00 |
 Other than Norway |  |  |  |  |  | 40,483 | 267 | (0.7) | 1.51 (1.26 to 1.81) | 1.28 (1.06 to 1.55) |