Table 1 Basic clinical characteristics of participants before and after sample weighting
Variables | Unweighted sample | Weighted sample | ||||
|---|---|---|---|---|---|---|
Asthma group (n = 639) | Non-asthma group (n = 7,865) | p | Asthma group (n = 639) | Non-asthma group (n = 7,865) | p | |
Gender | < 0.001 | < 0.001 | ||||
Male | 234(36.6%) | 3,862(49.1%) | 234(36.1%) | 3,862(49.1%) | ||
Female | 405(63.4%) | 4,003(50.9%) | 405(63.9%) | 4,003(50.9%) | ||
Age (years) | 47 (32,63) | 47 (32,65) | 0.466 | 46.0 (44.2,47.9) | 46.4 (45.5,47.4) | 0.664 |
Race | < 0.001 | < 0.001 | ||||
Mexican American | 72(11.3%) | 1,673(21.3%) | 72(4.0%) | 1,673(8.4%) | ||
Other Hispanic | 17(2.7%) | 249(3.2%) | 17(2.2%) | 249(3.6%) | ||
Non-Hispanic White | 370(57.9%) | 4,018(51.1%) | 370(77.1%) | 4,018(71.9%) | ||
Non-Hispanic Black | 155(24.3%) | 1,608(20.4%) | 155(11.8%) | 1,608(11.0%) | ||
Other races | 25(3.9%) | 317(4.0%) | 25(4.9%) | 317(5.1%) | ||
Marital status | 0.011 | 0.082 | ||||
Married or living with a partner | 370(57.9%) | 4,952(63.0%) | 370(61.1%) | 4,952(66.2%) | ||
Unmarried or living alone | 269(42.1%) | 2,913(37.0%) | 269(38.9%) | 2,913(31.8%) | ||
Family history | < 0.001 | < 0.001 | ||||
Yes | 327(51.2%) | 1,490(18.9%) | 327(50.7%) | 1,490(19.7%) | ||
No | 312(48.8%) | 6,375(81.1%) | 312(49.3%) | 6,375(80.3%) | ||
Smoking history | 0.243 | 0.792 | ||||
Non-smoker | 310(48.5%) | 4,071(51.8%) | 310(50.1%) | 4,071(50.5%) | ||
Used to smoke | 183(28.6%) | 2,049(26.0%) | 183(26.2%) | 2,049(25.0%) | ||
Currently smoking | 146(22.9%) | 1,745(22.2%) | 146(23.7%) | 1,745(24.5%) | ||
Serum vitamin C (mg/dL) | 0.91 (0.55,1.22) | 0.97 (0.63,1.24) | 0.015 | 0.92 (0.85,0.98) | 0.96 (0.93,0.99) | 0.126 |