Table 1.
Baseline characteristics of children included (n =3047) and not included (n = 2659)
| Baseline characteristics | Included n (%) | Not included n (%) | p-value |
|---|---|---|---|
| Male sex | 1569 (51.5) | 1377 (51.8) | 0.79 |
| Birth weight | 3.45 ± 0.43 | 3.45 ± 0.47 | 0.83 |
| Residence in city | 2163 (71.0) | 1808 (68.0) | 0.46 |
| Environmental smoke | 768 (25.2) | 723 (27.2) | 0.61 |
| Cesarean | 2142 (70.3) | 1840 (70.4) | 0.95 |
| Formula-feeding | 985 (32.6) | 863 (33.1) | 0.64 |
| Parental allergy | 703 (23.1) | 361 (13.8) | 0.01 |
| Pets | 693 (23.0) | 606 (23.2) | 0.92 |
| House redecoration | 250 (8.4) | 195 (7.7) | 0.75 |
| Stressful family | 605 (20.3) | 541 (21.1) | 0.68 |
Total numbers may not be equal to 3047 and 2659 for some characteristics due to missing data