Risk factors for unplanned hospital admission in infants in England and Ontario, 2010–2013
| Ontario | England | ||||
| OR (95% CI) | p Value | OR (95% CI) | p Value | ||
| Gestational age at birth (weeks) | Full term (39+) | 1 | <0.001 | 1 | <0.001 |
| Early term (37-38) | 1.64 (1.59 to 1.70) | 1.39 (1.37 to 1.40) | |||
| Late preterm (34-36) | 2.44 (2.29 to 2.61) | 1.66 (1.62 to 1.70) | |||
| Newborn length of stay (days) | <2 | 1 | 0.024 | 1 | <0.001 |
| 2–6 | 1.02 (0.98 to 1.06) | 1.08 (1.07 to 1.10) | |||
| 7–13 | 0.91 (0.83 to 1.00) | 1.38 (1.34 to 1.41) | |||
| Size for gestation | Small (<10th percentile) | 1.02 (0.98 to 1.03) | <0.001 | 1.07 (1.05 to 1.09) | <0.001 |
| Normal | 1 | 1 | |||
| Large (>90th percentile) | 1.06 (1.01 to 1.12) | 1.00 (0.98 to 1.01) | |||
| Maternal age (years) | ≤19 | 1.36 (1.26 to 1.46) | <0.001 | 1.49 (1.46 to 1.52) | <0.001 |
| 20–24 | 1.18 (1.12 to 1.24) | 1.20 (1.19 to 1.22) | |||
| 25–29 | 1 | 1 | |||
| 30–34 | 0.96 (0.93 to 1.00) | 0.90 (0.89 to 0.91) | |||
| 35–39 | 0.95 (0.91 to 1.00) | 0.83 (0.82 to 0.84) | |||
| ≥40 | 0.95 (0.88 to 1.03) | 0.82 (0.80 to 0.84) | |||
| Female sex | 0.79 (0.76 to 0.81) | <0.001 | 0.80 (0.80 to 0.81) | <0.001 | |
| Primiparous mother | 0.92 (0.89 to 0.95) | <0.001 | 0.89 (0.88 to 0.90) | <0.001 | |
| Multiple birth | 0.66 (0.59 to 0.74) | <0.001 | 0.81 (0.78 to 0.84) | <0.001 | |
| Deprivation quintile | Most deprived | 1.12 (1.06 to 1.17) | <0.001 | 1.03 (1.01 to 1.04) | <0.001 |
| 2 | 1.05 (1.00 to 1.10) | 1.01 (1.00 to 1.03) | |||
| 3 | 1.06 (1.00 to 1.11) | 1.01 (0.99 to 1.02) | |||
| 4 | 1.06 (1.00 to 1.11) | 0.99 (0.98 to 1.00) | |||
| Most affluent | 1 | 1 | |||
| Caesarean section | 0.77 (0.74 to 0.80) | <0.001 | 1.04 (1.02 to 1.05) | <0.001 | |
| Admission to neonatal intensive care | 1.03 (0.98 to 1.09) | 0.232 | 1.03 (1.01 to 1.05) | <0.001 | |
| Season of discharge | January to March | 1 | <0.001 | 1 | <0.001 |
| April to June | 0.89 (0.85 to 0.93) | 1.08 (1.07 to 1.10) | |||
| July to September | 0.91 (0.87 to 0.95) | 1.08 (1.07 to 1.10) | |||
| October to December | 1.06 (1.02 to 1.11) | 1.08 (1.06 to 1.09) | |||
| Quarter year of discharge | 1.01 (1.01 to 1.02) | <0.001 | 1.00 (1.00 to 1.00) | <0.001 | |
| Perinatal infection | 1.09 (0.94 to 1.28) | 0.249 | 1.09 (1.06 to 1.12) | <0.001 | |
| Prematurity related risk factor | 0.87 (0.77 to 0.99) | 0.033 | 1.01 (0.96 to 1.06) | 0.715 | |
| Neonatal medical condition | 1.82 (1.68 to 1.97) | <0.001 | 1.84 (1.79 to 1.89) | <0.001 | |
| Pregnancy risk factor | 1.07 (1.02 to 1.12) | 0.003 | 1.00 (.099 to 1.03) | 0.525 | |
| Delivery risk factor | 1.01 (0.97 to 1.06) | 0.605 | 1.01 (1.00 to 1.03) | 0.112 | |