Characteristics of the study population according to Pi phenotype (mean (SD) values or percentages)
| Pi M | Pi heterozygotes | |||
|---|---|---|---|---|
| No | Mean/% | No | Mean/% | |
| *Geometric mean. Totals may vary due to missing values. | ||||
| Age (years) | 936 | 13.37 (0.7) | 61 | 13.3 (0.8) |
| Height (cm) | 936 | 158.8 (8.4) | 61 | 159.5 (9.1) |
| BMI (kg/m2) | 936 | 20.9 (3.2) | 61 | 20.6 (3.9) |
| Sex (male) | 503 | 53.7% | 38 | 62.3% |
| Parental smoking (yes) | 583 | 64.1% | 39 | 66.1% |
| Asthma (yes) | 74 | 8% | 3 | 4.9% |
| Skin reactivity (positive) | 249 | 26.7% | 13 | 21.7% |
| PC20 methacholine (≤4 mg/ml) | 102 | 11.6% | 6 | 10.2% |
| Urinary cotinine/creatinine (ng/mg)* | 925 | 19.6 (2.7) | 60 | 17.8 (2.7) |
| Active smokers (yes) | 65 | 8% | 4 | 6.5% |