Model 1 | Model 2 | Model 3 | |
Country | |||
England | 1.59 (1.36 to 1.85) | 1.40 (1.20 to 1.63) | 1.19 (1.02 to 1.39) |
Sweden (baseline) | 1 | 1 | 1 |
Birth weight (g) | |||
500–1499 | 8.58 (5.81 to 12.67) | 6.83 (4.62 to 10.09) | |
1500–2499 | 4.17 (3.33 to 5.22) | 3.33 (2.66 to 4.18) | |
2500–3499 | 1.80 (1.57 to 2.06) | 1.59 (1.39 to 1.83) | |
≥3500 (baseline) | 1 | 1 | |
Gestational age (weeks) | |||
24–34 | 1.81 (1.35 to 2.43) | 1.98 (1.48 to 2.66) | |
35–36 | 2.12 (1.71 to 2.63) | 2.25 (1.82 to 2.79) | |
37–38 | 1.44 (1.26 to 1.65) | 1.52 (1.33 to 1.74) | |
≥39 (baseline) | 1 | 1 | |
Sex | |||
Boy | 1.68 (1.51 to 1.88) | 1.66 (1.49 to 1.86) | |
Girl (baseline) | 1 | 1 | |
Congenital anomaly | |||
Yes | 1.09 (0.85 to 1.40) | 1.07 (0.83 to 1.37) | |
No | 1 | 1 | |
Maternal age (years) | |||
<20 | 4.45 (3.68 to 5.37) | ||
20–24 | 2.45 (2.08 to 2.90) | ||
25–29 | 1.49 (1.26 to 1.77) | ||
30–34 (baseline) | 1 | ||
≥35 | 1.06 (0.86 to 1.30) | ||
Quintile of socioeconomic status | |||
Q1: most deprived | 2.19 (1.78 to 2.70) | ||
Q2 | 2.05 (1.66 to 2.53) | ||
Q3 | 1.54 (1.23 to 1.93) | ||
Q4 | 1.41 (1.12 to 1.78) | ||
Q5: least deprived (baseline) | 1 |
Data are adjusted HR with 95% CI. Each column represents a separate Cox PH model: model 1 was only adjusted for indicator of country with Sweden as baseline, model 2 was additionally adjusted for birth characteristics (birth weight, gestational age and presence of congenital anomalies), and model 3 was further adjusted for socioeconomic factors (socioeconomic status and maternal age).
PH, proportional hazards; SUDI, sudden unexpected death in infancy.