Characteristics of children with an available CS-IgE measurement
| Variable | No at birth (%) | Percentage by levels of CS-IgE | p value(χ2 test) | ||
|---|---|---|---|---|---|
| <0.5 | ⩾0.5 | ||||
| CS-IgE, cord serum IgE. | |||||
| Total | 1358 | 87.2 | 12.8 | ||
| Sex | |||||
| Male | 696 (48.7) | 86.6 | 13.4 | 0.54 | |
| Female | 661 (51.2) | 87.8 | 12.2 | ||
| Missing | 1 (0.1) | 100 | 0.0 | ||
| Birth weight (g) | |||||
| <1500 | 27 (2.0) | 88.9 | 11.1 | 0.76 | |
| 1500–2500 | 44 (3.3) | 87.2 | 12.8 | ||
| 2500–4000 | 1124 (82.8) | 90.9 | 9.1 | ||
| >4000 | 163 (12.0) | 85.3 | 14.7 | ||
| Neonatal complications | |||||
| Yes | 188 (13.8) | 85.6 | 14.4 | 0.76 | |
| No | 1170 (86.2) | 87.4 | 12.6 | ||
| Having a pet at recruitment | |||||
| Yes | 779 (56.6) | 87.0 | 13.0 | 0.81 | |
| No | 589 (43.4) | 87.4 | 12.6 | ||
| Season of birth | |||||
| Spring | 315 (56.3) | 87.2 | 12.8 | 0.13 | |
| Summer | 305 (56.3) | 87.9 | 12.1 | ||
| Autumn | 296 (56.3) | 83.1 | 16.9 | ||
| Winter | 442 (56.3) | 88.5 | 11.5 | ||
| Age of mother at delivery (years) | |||||
| ⩽23 | 389 (28.6) | 86.1 | 13.9 | 0.54 | |
| 24–33 | 801 (59.0) | 87.4 | 12.6 | ||
| ⩾34 | 145 (10.7) | 89.7 | 10.3 | ||
| Missing | 23 (1.7) | 82.6 | 17.4 | ||
| Maternal smoking during pregnancy | |||||
| Yes | 332 (24.6) | 87.2 | 12.8 | 0.99 | |
| No | 1012 (74.5) | 87.1 | 12.9 | ||
| Missing | 12 (0.9) | 91.7 | 8.3 | ||
| Maternal history of atopy | |||||
| Yes | 438 (32.3) | 84.0 | 16.0 | 0.02 | |
| No | 905 (66.6) | 88.6 | 11.4 | ||
| Missing | 15 (1.1) | 93.3 | 6.7 | ||
| Paternal history of atopy | |||||
| Yes | 352 (25.9) | 85.0 | 15.0 | 0.11 | |
| No | 984 (72.4) | 88.2 | 11.8 | ||
| Missing | 23 (1.7) | 78.3 | 21.7 | ||