Table 1 Comparison of analytical subsample with complete cohort
Variables | Â | Males | Females | ||||
|---|---|---|---|---|---|---|---|
Categorical variables |  | Subsample (n = 122); n (%) | Complete cohort (n = 552); n (%) | P-value | Subsample (n = 102); n (%) | Complete cohort (n = 584); n (%) | P-value |
Asthma incidence | Yes | 12 (9.84%) | 31 (7.43%) | 0.39 | 8 (7.84%) | 45 (9.59%) | 0.58 |
| Â | No | 110 (90.16%) | 386 (92.57%) | Â | 94 (92.16%) | 424 (90.41%) | Â |
Socio-economic status | Low | 15 (12.40%) | 75 (16.09%) | 0.38 | 18 (17.82%) | 78 (15.06%) | 0.77 |
| Â | Mid | 97 (80.17%) | 345 (74.03%) | Â | 75 (74.26%) | 400 (77.22%) | Â |
| Â | High | 9 (7.44%) | 46 (9.87%) | Â | 8 (7.92%) | 40 (7.72%) | Â |
Active smoking status (18Â years) | Past | 28 (23.14%) | 76 (17.55%) | 0.37 | 21 (20.79%) | 100 (20.37%) | 0.55 |
| Â | Current | 28 (23.14%) | 112 (25.87%) | Â | 22 (21.78%) | 132 (26.88%) | Â |
| Â | Never | 65 (53.72%) | 245 (56.58%) | Â | 58 (57.43%) | 259 (52.75%) | Â |
Second-hand smoking (1, 2, 4Â years) | Yes | 62 (52.10%) | 333 (62.95%) | 0.03 | 58 (56.86%) | 337 (59.86%) | 0.57 |
| Â | No | 57 (47.90%) | 196 (37.05%) | Â | 44 (43.14%) | 226 (40.14%) | Â |
Continuous variables | Mean ± SD | Mean ± SD |  | Mean ± SD | Mean ± SD |  | |
|---|---|---|---|---|---|---|---|
Age of puberty | 14.14 ± 1.10 | 14.26 ± 1.17 | 0.25 | 12.6 ± 1.35 | 12.7 ± 1.41 | 0.54 | |