Table 2.
Anthropometric data and distribution of known risk factors for respiratory symptoms during the first year of life among the three MBL tertiles of the 185 study children
| Low MBL tertile (<600 ng/ml) | Middle MBL tertile (600–1931 ng/ml) | High MBL tertile (>1931 ng/ml) | |
|---|---|---|---|
| Number of subjects | 62 | 62 | 61 |
| Gender (male/female) | 37/25 | 38/24 | 32/29 |
| Gestational age, wk | 39.9 (38.9–40.6) | 40.1 (39.1–41.0) | 40.1 (39.6–40.7) |
| Birth weight, kg | 3410 (3160–3710) | 3210 (3040–3590) | 3430 (3100–3660) |
| Older siblings (none/one/two or more) | 26/21/15 | 36/17/9 | 32/19/10 |
| Parental* asthma | 12 (19) | 16 (26) | 13 (21) |
| Maternal asthma | 9 (15) | 8 (13) | 5 (8) |
| Paternal asthma | 5 (8) | 8 (13) | 8 (13) |
| Parental smoking* | 28 (45) | 13 (21) | 13 (21) |
| Maternal smoking during pregnancy | 11 (18) | 8 (13) | 5 (8) |
| Paternal smoking | 24 (39) | 10 (16) | 12 (20) |
| Day‐care attendance | 12 (20) | 16 (26) | 14 (23) |
Data are given as median (interquartile range) or number (percentage) of infants.
*Parental asthma is defined as presence of maternal and/or paternal asthma; parental smoking is defined accordingly.