Table 1 Perinatal mortality for singleton births in Norway 1967–1976 (n = 531 098) and 1977–1986 (n = 416 735) according to LMP-based gestational age and size at birth (small-for-gestational-age [SGA] and non-SGA)
Non-SGA | SGA | ||||||
|---|---|---|---|---|---|---|---|
Gestational age in weeks | Perinatal deaths n (per 1000) | Adjusted ORα | 95% CI | Perinatal deaths n (per 1000) | SGA% of deaths per week | Adjusted ORα | 95% CI |
1967–1976 | |||||||
37 | 192 (11.4) | 4.1 | 3.5–4.9 | 213 (89.0) | 52.6 | 35.1 | 29.5–41.7 |
38 | 228 (5.6) | 2.0 | 1.7–2.4 | 226 (40.7) | 49.8 | 15.3 | 13.0–18.1 |
39 | 293 (3.1) | 1.1 | 0.96–1.3 | 236 (18.3) | 44.6 | 6.9 | 5.8–8.1 |
40 | 379 (2.7) | 1.0 | Reference | 222 (11.3) | 36.9 | 4.3 | 3.6–5.1 |
41 | 327 (3.0) | 1.1 | 0.98–1.3 | 187 (12.4) | 36.4 | 4.7 | 4.0–5.6 |
≥42 | 316 (4.8) | 1.8 | 1.6–2.1 | 150 (15.1) | 32.2 | 5.8 | 4.8–7.0 |
1977–1986 | |||||||
37 | 94 (7.3) | 5.4 | 4.2–7.0 | 103 (62.0) | 52.3 | 49.0 | 37.9–63.4 |
38 | 110 (3.5) | 2.6 | 2.0–3.3 | 78 (19.0) | 41.5 | 14.4 | 11.0–19.0 |
39 | 155 (2.1) | 1.5 | 1.2–1.9 | 87 (9.3) | 36.0 | 7.1 | 5.4–9.2 |
40 | 147 (1.3) | 1.0 | Reference | 100 (7.4) | 40.5 | 5.6 | 4.4–7.3 |
41 | 150 (1.7) | 1.3 | 1.01–1.6 | 92 (8.8) | 38.0 | 6.7 | 5.2–8.8 |
≥42 | 124 (2.4) | 1.8 | 1.4–2.3 | 57 (8.8) | 31.5 | 6.7 | 4.9–9.1 |