Risk factor | Aboriginal | Non-Aboriginal | ||
---|---|---|---|---|
OR (95% CI) | PAF (95% CI) | OR (95% CI) | PAF (95% CI) | |
Male | 1.57 (1.32, 1.86) | 18.8 (11.5, 25.4) | 1.53 (1.46, 1.60) | 19.5 (17.5, 21.5) |
Gestational age <36 weeks | 1.26 (0.99, 1.62) | 2.5 (−0.3, 5.2) | 1.62 (1.50, 1.75) | 3.4 (2.8, 4.0) |
Maternal smoking* | 0.98 (0.83, 1.17) | - | 1.15 (1.08, 1.21) | 2.4 (1.4, 3.4) |
Maternal asthma* | 0.96 (0.75, 1.23) | - | 1.38 (1.29, 1.47) | 3.6 (2.8, 4.4) |
Percent optimal birthweight | ||||
Low <85% | 0.95 (0.77, 1.18) | - | 1.00 (0.93, 1.07) | - |
Normal 85-114% | Reference | Reference | ||
High ≥115% | 1.10 (0.81, 1.50) | 0.6 (−1.5, 2.7) | 1.07 (1.00, 1.15) | 0.7 (−0.01, 1.4) |
Previous pregnancies | ||||
0 | Reference | Reference | ||
1 | 0.97 (0.75, 1.27) | - | 1.13 (1.07, 1.20) | 3.3 (1.8, 4.9) |
2 | 1.00 (0.74, 1.38) | 0.1 (−3.7, 3.8) | 1.30 (1.22, 1.39) | 4.3 (3.2, 5.4) |
≥3 | 1.29 (0.97, 1.71) | 7.7 (−1.0, 15.7) | 1.38 (1.28, 1.47) | 5.4 (4.3, 6.6) |
Season of birth | ||||
Spring | Reference | Reference | ||
Summer | 1.14 (0.90, 1.45) | 2.6 (−2.2, 7.2) | 1.13 (1.06, 1.20) | 2.7 (1.3, 4.0) |
Autumn | 1.10 (0.87, 1.40) | 2.0 (−2.9, 6.6) | 1.23 (1.16, 1.31) | 4.7 (3.4, 6.1) |
Winter | 1.08 (0.85, 1.38) | 1.5 (−3.1, 6.0) | 1.10 (1.03, 1.17) | 2.0 (0.7, 3.3) |
Mode of delivery | ||||
Vaginal | Reference | Reference | ||
Instrumental | 1.01 (0.71, 1.43) | 0.05 (−1.9, 2.0) | 1.01 (0.94, 1.08) | 0.08 (−0.7, 0.9) |
Elective caesarean | 1.15 (0.85, 1.55) | 1.0 (−1.3, 3.2) | 1.25 (1.18, 1.32) | 3.4 (2.4, 4.3) |
Emergency caesarean | 1.18 (0.92, 1.50) | 1.9 (−1.1, 4.8) | 1.12 (1.05, 1.20) | 1.4 (0.6, 2.2) |
Maternal age | ||||
≥35 years | Reference | Reference | ||
30-34 years | 1.09 (0.73, 1.63) | 0.9 (−3.4, 5.1) | 1.10 (1.03, 1.18) | 2.6 (0.9, 4.4) |
25-29 years | 1.45 (1.00, 2.10) | 7.1 (0.2, 13.6) | 1.28 (1.19, 1.37) | 6.1 (4.4, 7.7) |
20-24 years | 1.39 (0.95, 2.03) | 7.0 (−0.9, 14.4) | 1.47 (1.36, 1.59) | 5.2 (4.1, 6.3) |
<20 years | 1.69 (1.10, 2.57) | 8.4 (2.1, 14.3) | 1.82 (1.62, 2.04) | 2.4 (1.9, 2.9) |
Socio-economic index† | ||||
91-100% | Reference | Reference | ||
76-90% | 0.66 (0.22, 1.98) | - | 1.01 (0.92, 1.11) | 0.2 (−1.1, 1.4) |
26-75% | 0.92 (0.35, 2.43) | - | 1.09 (1.01, 1.19) | 3.8 (0.5, 7.0) |
11-25% | 1.27 (0.48, 3.34) | 6.3 (−21.1, 27.5) | 1.30 (1.19, 1.42) | 4.2 (2.8, 5.5) |
0-10% | 1.01 (0.38, 2.68) | 0.3 (−25.8, 21.0) | 1.23 (1.11, 1.37) | 1.7 (0.8, 2.5) |