Association of E-NAOI with maternal and infant characteristics
| Risk factor | No. of infants | (%) | No. infants with E-NAOI event | E-NAOI rate (%) | Adjusted relative risk (RR)* of E-NAOI among births with this characteristic (95% CI) |
| Maternal characteristics | |||||
| Age: <20 years | 17 928 | 3.71 | 1064 | 5.93 | 0.96 (0.89 to 1.02) |
| Age: 20–34 years | 3 67 164 | 75.88 | 19 119 | 5.21 | Reference |
| Age: ≥35 years | 98 757 | 20.41 | 5877 | 5.95 | 1.09 (1.05 to 1.13) |
| Primiparous | 1 76 472 | 36.46 | 10 860 | 6.16 | 1.29 (1.25 to 1.32) |
| Multiparous | 3 07 535 | 63.54 | 15 200 | 4.94 | Reference |
| Infant characteristics | |||||
| Female | 2 35 702 | 48.70 | 10 991 | 4.66 | Reference |
| Male | 2 48 242 | 51.30 | 15 068 | 6.07 | 1.32 (1.28 to 1.35) |
| Term | 4 50 454 | 93.07 | 13 978 | 3.10 | Reference |
| Preterm | 33 553 | 6.93 | 12 091 | 36.04 | 17.54 (17.06 to 18.04) |
| Multiple | 13 399 | 2.77 | 3008 | 22.45 | 1.14 (1.08 to 1.19) |
*Adjusted for maternal age, parity, infant sex, preterm and multiple birth. One hundred and fifty-eight and 63 records were missing maternal age and infant sex, respectively.
E-NAOI, English-version neonatal adverse outcome indicator.