Subgroup | No. of Children | C-ACT (mean) | Difference in C-ACT | Test for interaction (P) | ||
---|---|---|---|---|---|---|
 |  | Placebo | Vitamin C | Estimate | 95% CI |  |
All | 60 | 16.57 | 19.60 | 3.03 | 2.53-3.54 | Â |
C-ACT at baseline | Â | Â | Â | Â | Â | Â |
13-15 | 30 | 15.8 | 18.1 | 2.3 | 1.7-3.0 | 0.004a) |
16-19 | 30 | 17.3 | 21.1 | 3.7 | 3.0-4.5 | Â |
FEV1/FVC (%) | Â | Â | Â | Â | Â | Â |
< 59 | 28 | 16.4 | 19.3 | 2.9 | 2.3-3.6 | 0.7a) |
≥59 | 32 | 16.8 | 19.9 | 3.1 | 2.3-3.9 |  |
FEV1 at baseline (L/s) | Â | Â | Â | Â | Â | Â |
< 1.1 | 29 | 16.7 | 20.3 | 3.6 | 3.0-4.3 | 0.013a) |
≥1.1 | 31 | 16.5 | 18.9 | 2.5 | 1.7-3.2 |  |
Age (yr) | Â | Â | Â | Â | Â | Â |
7.0-8.2 | 30 | 16.6 | 20.3 | 3.7 | 3.1-4.3 | 0.004a) |
8.3-10 | 30 | 16.5 | 18.9 | 2.3 | 1.5-3.1 | Â |
Weight (kg) | Â | Â | Â | Â | Â | Â |
23-28 | 29 | 16.6 | 19.3 | 2.7 | 1.9-3.5 | 0.2a) |
29-37 | 31 | 16.6 | 19.9 | 3.3 | 2.7-4.0 | Â |
Gender | Â | Â | Â | Â | Â | Â |
Girl | 22 | 16.5 | 19.5 | 3.0 | 2.2-3.9 | 1.0 |
Boy | 38 | 16.6 | 19.6 | 3.0 | 2.3-3.7 | Â |
Dampness exposure | Â | Â | Â | Â | Â | Â |
Never | 25 | 16.8 | 19.2 | 2.4 | 1.4-3.4 | 0.1b) |
During past 1 yr | 20 | 16.3 | 19.7 | 3.4 | 2.6-4.2 | Â |
Earlier | 14 | 16.5 | 20.1 | 3.6 | 2.8-4.4 | Â |
Smoking by the father | Â | Â | Â | Â | Â | Â |
Never | 21 | 16.5 | 19.0 | 2.5 | 1.6-3.5 | 0.4c) |
Current | 22 | 16.8 | 19.8 | 3.0 | 2.2-3.9 | Â |
Ex-smoker | 17 | 16.4 | 20.0 | 3.6 | 2.7-4.6 | Â |
Residential area | Â | Â | Â | Â | Â | Â |
Urban | 34 | 16.5 | 19.5 | 3.0 | 2.4-3.7 | 1.0 |
Rural | 26 | 16.7 | 19.7 | 3.0 | 2.2-3.9 | Â |