Table 1. Background characteristics of participants in the development dataset.
| Characteristic | Total (n = 18,549) | With food allergy (n = 1,747) | Without food allergy (n = 16,802) | p value | |
|---|---|---|---|---|---|
| High-risk birth months (August–December) | 7,744 (41.7) | 912 (52.2) | 6,832 (40.7) | <0.001 | |
| Male sex | 9,480 (51.1) | 968 (55.4) | 8,512 (50.7) | <0.001 | |
| First child | 9,593 (51.7) | 984 (56.3) | 8,609 (51.2) | <0.001 | |
| Eczema | 7,229 (39.0) | 1,334 (76.4) | 5,895 (35.1) | <0.001 | |
| Family history of atopic dermatitis | |||||
| Father | 2,164 (11.7) | 337 (19.3) | 1,827 (10.9) | <0.001 | |
| Mother | 3,088 (16.6) | 437 (25.0) | 2,651 (15.8) | <0.001 | |
| Siblings* | 1,013/8,956 (11.3) | 122/763 (16.0) | 891/8,193 (10.9) | <0.001 | |
| Family history of food allergy | |||||
| Father | 824 (4.4) | 138 (7.9) | 686 (4.1) | <0.001 | |
| Mother | 1,006 (5.4) | 195 (11.2) | 811 (4.8) | <0.001 | |
| Siblings* | 1,254/8,956 (14.0) | 221/763 (29.0) | 1,033/8,193 (12.6) | <0.001 | |
| Family history of bronchial asthma | |||||
| Father | 1,374 (7.4) | 189 (10.8) | 1,185 (7.1) | <0.001 | |
| Mother | 1,395 (7.5) | 174 (10.0) | 1,221 (7.3) | <0.001 | |
| Siblings* | 741/8,956 (8.3) | 89/763 (11.7) | 652/8,193 (8.0) | 0.001 | |
| Family history of allergic rhinitis/conjunctivitis | |||||
| Father | 2,883 (15.5) | 353 (20.2) | 2,530 (15.1) | <0.001 | |
| Mother | 3,915 (21.1) | 422 (24.2) | 3,493 (20.8) | 0.001 | |
| Siblings* | 1,093/8,956 (12.2) | 108/763 (14.2) | 985/8,193 (12.0) | 0.14 | |
| Family history of hay fever | |||||
| Father | 6,553 (35.3) | 755 (43.2) | 5,798 (34.5) | <0.001 | |
| Mother | 6,614 (35.7) | 742 (42.5) | 5,872 (34.9) | <0.001 | |
| Siblings* | 1,205/8,956 (13.5) | 129/763 (16.9) | 1,076/8,193 (13.1) | 0.01 | |
Values are presented as number (%).
Each p value was calculated using chi-square test.
*The proportions were calculated based on the participants with at least one sibling.