Table 1.
Descriptive statistics for the study population
| NWNA (Controls) (n = 671) | CUW (Wheezers) (n = 190) | P value | CUWA (Active Asthmatics) (n = 69) | P value | |
|---|---|---|---|---|---|
| Age (yrs)a | 17.0 (15.9–18.0) | 17.0 (16.0–18.1) | 0.360 | 16.9 (15.9–18.1) | 0.549 |
| Sex (% male)b | 40.5 % | 43.1 % | 0.517 | 43.5 % | 0.626 |
| Vitamin D levels (ng/ml)a | 22.9 (10.9–35.9) | 22.9 (10.5–23.8) | 0.946 | 21.1 (8.8–30.81) | 0.017 |
| Sensitization (% positive)b | 25.7 % | 41.4 % | <0.001 | 52.0 % | <0.001 |
| Rhinitis (% positive)b | 18.4 % | 41.5 | <0.001 | 57.4 % | <0.001 |
| FVC (% predicted)a | 103.8 (72.7–135.9) | 104.9 (77.1–148.3) | 0.531 | 105.6 (78.0–153.6) | 0.484 |
| FEV1 (% predicted)a | 99.3 (69.6–125.3) | 99.1 (72.9–130.5) | 0.860 | 97.6 (62.0–125.6) | 0.398 |
NWNA Never Wheezing Never Asthma, CUW Current Wheezing, CUWA Current Wheezing and Asthma
aMean and 95 % CI, Independent sample t test for equality of means (2-sited significance)
bPercentage, χ 2 test (asymptomatic 2-sited significance)