| Number | Percent | OR (95% CI) | AOR (95% CI)a |
---|---|---|---|---|
Hyaline membrane disease | ||||
 Spontaneous conception | 14574 | 71.9 | Ref | Ref |
 HO | 154 | 72.0 | 1.00 (0.74–1.36) | 0.87 (0.62–1.21) |
 ART | 724 | 76.9 | 1.30 (1.11–1.52) | 1.18 (0.99–1.40) |
 AI | 38 | 72.1 | 0.93 (0.52–1.67) | 0.75 (0.41–1.42) |
Necrotizing enterocolitis | ||||
 Spontaneous conception | 817 | 4.0 | Ref | Ref |
 HO | 3 | 1.4 | 0.34 (0.11–1.04) | 0.33 (0.10–1.05) |
 ART | 49 | 5.2 | 1.30 (0.97–1.75) | 1.43 (1.04–1.97) |
 AI | 2 | 3.7 | 0.92 (0.22–3.80) | 0.85 (0.20–3.60) |
Intra ventricular haemorrhage | ||||
 Spontaneous conception | 4327 | 23.1 | Ref | Ref |
 HO | 53 | 26.0 | 1.17 (0.85–1.60) | 1.23 (0.86–1.75) |
 ART | 229 | 25.6 | 1.14 (0.98–1.33) | 1.20 (1.00–1.43) |
 AI | 12 | 23.1 | 0.99 (0.52–1.90) | 1.21 (0.61–2.40) |
Retinopathy of prematurity | ||||
 Spontaneous conception | 3896 | 26.6 | Ref | Ref |
 HO | 49 | 31.6 | 1.27 (0.91–1.79) | 1.04 (0.70–1.52) |
 ART | 187 | 27.2 | 1.03 (0.87–1.22) | 1.00 (0.82–1.24) |
 AI and other | 10 | 23.3 | 0.83 (0.41–1.70) | 0.99 (0.44–2.17) |
Major surgery | ||||
 Spontaneous conception | 1642 | 8.1 | Ref | Ref |
 HO | 23 | 10.7 | 1.37 (0.89–2.11) | 1.27 (0.79–2.02) |
 ART | 122 | 12.9 | 1.70 (1.39–2.06) | 1.71 (1.37–2.13) |
 AI | 6 | 11.1 | 1.43 (0.61–2.34) | 1.00 (0.389–2.60) |
Deaths | ||||
 Spontaneous conception | 1852 | 9.0 | Ref | Ref |
 HO | 20 | 9.3 | 1.02 (0.65–1.63) | 0.67 (0.38–1.18) |
 ART | 98 | 10.3 | 1.15 (0.93–1.43) | 1.11 (0.86–1.42) |
 AI | 9 | 16.7 | 2.01 (0.98–4.13) | 2.10 (0.93–4.76) |