Microcephaly and risk of poor birth outcomes before discharge from hospital
| Microcephaly (n=794) | No microcephaly (n=1 944 010) | Prevalence difference per 1000 (95% CI)* | Prevalence ratio (95% CI)* | |||
| Infants, N | Prevalence per 1000 | Infants, N | Prevalence per 1000 | |||
| Mortality | 51 | 64.23 | 5301 | 2.73 | 61.29 (44.37, 78.21) | 20.52 (15.57, 27.04) |
| Neonatal intensive care unit† | 132 | 205.93 | 59 219 | 37.47 | 160.86 (130.28, 191.43) | 4.80 (4.07, 5.67) |
| Very preterm, <32 weeks | 30 | 37.78 | 19 121 | 9.84 | 25.21 (12.64, 37.79) | 3.19 (2.23, 4.56) |
| Preterm, <37 weeks | 202 | 254.41 | 142 196 | 73.15 | 171.43 (141.81, 201.05) | 3.05 (2.66, 3.50) |
| Length of stay, ≥7 days | 174 | 219.14 | 77 786 | 40.01 | 172.69 (144.20, 201.19) | 4.62 (3.93, 5.43) |
| Length of stay, ≥14 days | 105 | 132.24 | 34 920 | 17.96 | 110.24 (87.02, 133.46) | 5.95 (4.80, 7.38) |
| Necrotising enterocolitis | 5 | 6.30 | 1496 | 0.77 | 5.55 (0.03, 11.06) | 6.59 (2.75, 15.82) |
| Intracranial haemorrhage | 13 | 16.37 | 2749 | 1.41 | 14.52 (5.73, 23.31) | 9.90 (5.71, 17.16) |
| Bronchopulmonary dysplasia | 8 | 10.08 | 2603 | 1.34 | 8.05 (1.55, 14.55) | 5.97 (3.01, 11.87) |
| Intrauterine growth restriction | 213 | 268.26 | 64 849 | 33.36 | 232.14 (201.29, 262.99) | 7.21 (6.35, 8.17) |
| Birth hypoxia | 95 | 119.65 | 117 232 | 60.30 | 47.46 (27.24, 67.68) | 1.88 (1.55, 2.27) |
| C-section | 175 | 220.40 | 394 103 | 202.73 | 10.43 (−17.84, 38.69) | 1.05 (0.93, 1.19) |
| Intubation | 39 | 49.12 | 14 506 | 7.46 | 38.76 (24.64, 52.88) | 5.75 (4.20, 7.87) |
| Transfusion | 19 | 23.93 | 5975 | 3.07 | 18.40 (8.43, 28.38) | 6.51 (4.15, 10.22) |
| Phototherapy | 69 | 86.90 | 73 033 | 37.57 | 46.28 (26.83, 65.74) | 2.12 (1.67, 2.66) |