| Asthma | Not asthma | Answers n | p‐value |
Medical factors | | | | |
Breastfeeding over 3 months | 152 (93) | 1591 (93) | 1881 | 0.67 |
Over three episodes of fever last year | 90 (55) | 442 (26) | 1835 | 0.00001 |
Eczema ever | 73 (45) | 583 (34) | 1858 | 0.007 |
Eczema over 4 weeks last year | 34 (21) | 186 (11) | 1689 | 0.00006 |
Use of antibiotic last year | 52 (32) | 563 (32) | 1884 | 0.67 |
Any reaction to food | 47 (29) | 193 (11) | 1851 | 0.00001 |
Hay fever | 21 (13) | 58 (3) | 1837 | 0.00001 |
Socioeconomical factors | | | | |
Day care attendance | 97 (60) | 1028 (59) | 1915 | 0.79 |
Proportion of boys | 90 (55) | 853 (50) | 1865 | 0.19 |
Less than five rooms at home | 71 (44) | 593 (35) | 1846 | 0.005 |
Daily smoking at home | 71 (44) | 683 (40) | 1859 | 0.59 |
Mother or father with chronic disease | 56 (35) | 278 (17) | 1884 | 0.0001 |
Father had higher education | 52 (34) | 623 (39) | 1733 | 0.18 |
Mother had higher education | 51 (31) | 567 (33) | 1861 | 0.67 |
Smoking during pregnancy | 45 (27) | 353 (21) | 1860 | 0.09 |
Parents divorced/new partner | 38 (23) | 270 (16) | 1858 | 0.008 |
No siblings | 35 (21) | 287 (17) | 1866 | 0.20 |
Single parent | 27 (17) | 197 (12) | 1861 | 0.05 |
Psychosocial problem, no action | 14 (9) | 90 (5) | 1716 | 0.07 |
Psychosocial problem, action needed | 9 (6) | 22 (1) | 1716 | 0.00001 |