Characteristics of the study population
| Characteristics at age 5 (n=1108) | Cows' milk (n=542) | Placebo (n=566) |
|---|---|---|
| Results expressed as percentages. | ||
| Sex, % female | 48.3 | 49.3 |
| No siblings at age 5 | 7.0 | 6.2 |
| Older siblings | 52.8 | 49.3 |
| Younger siblings | 56.5 | 61.7 |
| Family history of atopy: asthma or hay fever, assessed at age 5 | ||
| Maternal history (n=1107) | 29.4 | 30.7 |
| Paternal history (n=1091) | 30.0 | 30.0 |
| Both parents (n=1098) | 8.9 | 9.3 |
| At least one of the parents (n=1098) | 50.7 | 51.3 |
| Siblings history (n=1004) | 19.3 | 21.4 |
| At least one of the family members (n=1081) | 56.4 | 58.0 |
| Maternal education | ||
| Low | 26.1 | 27.4 |
| Middle | 41.9 | 41.0 |
| High | 32.0 | 31.6 |
| Exclusive breast feeding period | ||
| ≤2 weeks | 33.4 | 26.9 |
| >2 but ≤5 weeks | 14.8 | 14.8 |
| >5 weeks but ≤3 months | 22.5 | 27.0 |
| >3 but ≤4 months | 10.1 | 8.7 |
| >4 but ≤6 months | 10.9 | 14.5 |
| ≥6 months | 8.3 | 8.1 |
| Pets at home | ||
| Exposure before birth | 55.5 | 60.4 |
| Exposure at age 1 | 51.8 | 58.0 |
| Exposure at age 2 | 51.8 | 52.8 |
| Exposure at age 5 | 49.4 | 50.9 |
| Day care attendance until school age | 24.9 | 24.7 |
| Exposure until age 1 | 17.9 | 17.5 |
| Exposure age one until 2 | 20.7 | 20.2 |
| Exposure age 2 until 3 | 19.9 | 21.2 |
| Exposure age 3 until 4 | 19.9 | 19.5 |
| Smoking in the household | ||
| Exposure during pregnancy (maternal only) | 17.5 | 16.8 |
| Exposure at age 1 | 30.8 | 31.1 |
| Exposure at age 2 | 32.9 | 32.1 |
| Exposure at age 5 | 37.8 | 37.1 |