Table 5.
Prevalence of self-reported or measured chronic respiratory conditions and odds ratios, by COex level, among 317549 never smokers
| COex Category (ppm) | No. of never smokers | Cough frequently for ≥3 months |
Cough up sputum in morning for ≥ 3 months |
Self-reported tuberculosis |
Self-reported emphysema/ Chronic bronchitis |
Air flow obstruction (ie, FEV1/FVC < 0.7) at baseline |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No. (%a) | ORa (95% CI) | No. (%a) | ORa (95% CI) | No. (%a) | ORa (95% CI) | No. (%a) | ORa (95% CI) | No. (%a) | ORa (95% CI) | ||
| All areas | |||||||||||
| 1.0 – 7.0 | 262 792 | 6 055 (2.2) | 1.00 (0.95–1.05) | 5 453 (2.0) | 1.00 (0.95–1.05) | 2 999 (1.2) | 1.00 (0.95–1.06) | 5 982 (2.1) | 1.00 (0.96–1.05) | 10 946 (3.8) | 1.00 (0.96–1.04) |
| 7.0 – 14.0 | 36 859 | 909 (2.8) | 1.25 (1.18–1.33) | 859 (2.6) | 1.29 (1.21–1.37) | 652 (1.4) | 1.21 (1.13–1.30) | 766 (2.5) | 1.16 (1.09–1.25) | 1 390 (5.2) | 1.38 (1.31–1.45) |
| ≥14.0 | 17898 | 429 (2.9) | 1.30 (1.17–1.44) | 438 (2.9) | 1.47 (1.32–1.63) | 261 (1.5) | 1.28 (1.12–1.46) | 282 (2.6) | 1.20 (1.06–1.36) | 700 (6.2) | 1.65 (1.52–1.80) |
| P for trend | 0.01 | <0.0001 | <0.0001 | <0.0001 | 0.0009 | ||||||
| Urban | |||||||||||
| 1.0 – 7.0 | 129407 | 2352 (1.8) | 1.00 (0.95–1.05) | 2286 (1.8) | 1.00 (0.95–1.06) | 1923(1.6) | 1.00(0.95–1.06) | 3197 (2.5) | 1.00 (0.95–1.05) | 4460 (3.3) | 1.00 (0.96–1.04) |
| 7.0 – 14.0 | 13431 | 298 (2.3) | 1.27 (1.13–1.42) | 312 (2.3) | 1.29 (1.16–1.45) | 371(1.9) | 1.18(1.07–1.31) | 331 (2.5) | 1.03 (0.92–1.15) | 368 (3.9) | 1.19 (1.07–1.32) |
| ≥14.0 | 2808 | 68 (2.4) | 1.35 (1.06–1.71) | 69 (2.4) | 1.35 (1.06–1.71) | 84(2.1) | 1.34(1.07–1.67) | 72 (2.8) | 1.13 (0.89–1.43) | 73 (3.8) | 1.15 (0.91–1.46) |
| P for trend | <0.0001 | <0.0001 | 0.0004 | 0.33 | 0.005 | ||||||
| Rural | |||||||||||
| 1.0 – 7.0 | 133385 | 3703 (2.6) | 1.00 (0.94–1.06) | 3167 (2.2) | 1.00 (0.94–1.07) | 1 076(0.8) | 1.00(0.91–1.10) | 2785 (1.9) | 1.00 (0.93–1.07) | 6486 (4.2) | 1.00 (0.95–1.05) |
| 7.0 – 14.0 | 23428 | 611 (3.2) | 1.24 (1.16–1.34) | 547 (2.8) | 1.29 (1.20–1.40) | 281(1.0) | 1.25(1.12–1.39) | 435 (2.4) | 1.31 (1.20–1.43) | 1022 (6.2) | 1.52 (1.44–1.61) |
| ≥14.0 | 15090 | 361 (3.2) | 1.27 (1.13–1.43) | 369 (3.3) | 1.51 (1.34–1.70) | 177(1.1) | 1.29(1.09–1.52) | 210 (2.3) | 1.26 (1.08–1.46) | 627 (7.5) | 1.88 (1.71–2.06) |
| P for trend | <0.0001 | 0.0004 | 0.002 | <0.0001 | <0.0001 | ||||||
aadjusted for age at survey, sex, area, season, time of day and educational level.