Factors associated with hospitalisation of infants with any anomaly or rare disease of congenital origin
| Characteristics | Number of admissions | ||
| 2+ | 1 | 0 | |
| No. of infants (%) | No. of infants (%) | No. of infants (%) | |
| n=10 785 | n=6043 | n=8695 | |
| Sociodemographic factors | |||
| Townsend quintile | |||
| 1 (least deprived) | 1542 (14.3) | 991 (16.4) | 1272 (16.3) |
| 2 | 1645 (15.3) | 956 (15.8) | 1316 (16.9) |
| 3 | 1928 (17.9) | 1102 (18.3) | 1571 (20.1) |
| 4 | 2351 (21.8) | 1257 (20.8) | 1558 (20.0) |
| 5 (most deprived) | 3296 (30.6) | 1727 (28.6) | 2080 (26.7) |
| Maternal ethnicity | |||
| White | 6729 (94.5) | 3547 (93.8) | 4252 (95.0) |
| Other | 394 (5.5) | 236 (6.2) | 224 (5.0) |
| Maternal age at birth, years | |||
| Mean (SD) (years) | 27.8 (6.3) | 28.3 (6.2) | 28.6 (6.2) |
| Median (IQR) | 28 (23–32) | 28 (24–33) | 29 (24–33) |
| ≤24 | 3596 (33.3) | 1768 (29.3) | 2204 (28.2) |
| 25–29 | 2880 (26.7) | 1697 (28.1) | 2096 (26.8) |
| 30–34 | 2585 (24.0) | 1526 (25.3) | 2046 (26.2) |
| ≥35 | 1720 (16.0) | 1050 (17.4) | 1468 (18.9) |
| Maternal factors | |||
| Parity | |||
| Nulliparous | 4572 (45.2) | 2454 (43.6) | 3029 (43.3) |
| ≥1 | 5535 (54.8) | 3173 (56.4) | 3973 (56.7) |
| Multiple fetus | |||
| Yes | 417 (3.9) | 175 (2.9) | 185 (2.4) |
| No | 10 365 (96.1) | 5866 (97.1) | 7640 (97.6) |
| Maternal smoking | |||
| Smoker | 2200 (30.7) | 1036 (27.1) | 1136 (25.5) |
| Non/ex-smoker | 4958 (69.3) | 2783 (72.9) | 3315 (74.5) |
| Anomalies in previous pregnancies | |||
| Yes | 928 (12.0) | 506 (12.2) | 582 (12.0) |
| No | 6811 (88.0) | 3637 (87.8) | 4280 (88.0) |
| Infant factors | |||
| Infant sex | |||
| Male | 6595 (61.2) | 3599 (59.6) | 5205 (59.9) |
| Female | 4187 (38.8) | 2441 (40.4) | 3486 (40.1) |
| Birth weight, g | |||
| Mean (SD) | 3024 (810) | 3207 (697) | 3286 (660) |
| Median (IQR) | 3140 (2610–3570) | 3280 (2860–3660) | 3350 (2950–3710) |
| <2500 (low birth weight) | 2311 (21.5) | 815 (13.5) | 806 (10.1) |
| ≥2500 | 8441 (78.5) | 5209 (86.4) | 7166 (89.9) |
| Gestational age, weeks | |||
| Mean (SD) | 37.9 (3.3) | 38.6 (2.6) | 39.0 (2.3) |
| Median (IQR) | 39 (37–40) | 39 (38–40) | 39 (38–40) |
| <37 (preterm) | 2287 (21.3) | 844 (14.0) | 727 (9.1) |
| ≥37 (term) | 8465 (78.7) | 5178 (86.0) | 7249 (90.9) |
Missing data are not shown due to risk of statistical disclosure.