Table 1 Descriptive characteristics of the study cohort.
| Â | Â | Total group | Subgroup with OC and immune markers |
|---|---|---|---|
| Â | Â | (N = 671) | (n = 331) |
| Â | Â | % | % |
Boys | Â | 53.1 | 56.8 |
Age | 7 years | 45.8 | 46.2 |
| Â | 8 years | 50.2 | 50.2 |
|  | 9–10 years | 4.1 | 3.6 |
Passive smoking in the child's home during the last 12 months (cigarettes per day) | Â | Â | |
| Â | None | 52.2 | 66.5 |
|  | 1–10 | 23.4 | 24.8 |
|  | 11–20 | 14.3 | 5.3 |
| Â | more than 30 | 10.1 | 2.4 |
Number of infections during the last 12 months | Â | Â | |
| Â | None | 6.0 | 5.7 |
| Â | 1 to < 5 | 74.7 | 74.8 |
| Â | 5 to 10 | 17.2 | 17.4 |
| Â | more than 10 | 2.1 | 2.1 |
Duration of total breastfeeding (weeks) | Â | Â | |
| Â | 0 | 19.1 | 15.1 |
| Â | 1 to < 5 | 7.9 | 15.4 |
|  | 5 – 8 | 12.5 | 12.1 |
|  | 9–12 | 10.6 | 11.8 |
| Â | more than 12 | 34.7 | 41.1 |
| Â | Missing | 5.2 | 4.5 |
Serum cholesterol concentration | |||
(mean, 5–95%-value, mg/dL) |  |  | 186 (143–235) |
Triglyceride concentration | Â | Â | Â |
(mean, 5–95%-value, mg/dL) |  |  | 130 (53–262) |