Longitudinal analysis of ETS exposure and health status at 18 month follow up (n=326 non-smokers)
| Asthma severity | Physical health status | Asthma-specific QOL | |||||
|---|---|---|---|---|---|---|---|
| ETS exposure measure | n (%) | B coefficient* (95% CI) | Multivariate B coefficient† (95% CI) | B coefficient* (95% CI) | Multivariate B coefficient† (95% CI) | B coefficient* (95% CI) | Multivariate B coefficient† (95% CI) |
| *Linear regression analysis to evaluate impact of baseline exposure on outcome at 18 months, controlling for baseline severity of asthma score. | |||||||
| †Controlling for baseline severity of asthma score and other covariates: age, sex, income, educational attainment. | |||||||
| ‡Reported eye or nose irritation after ETS exposure, past 7 days. | |||||||
| Baseline exposure: any v none | |||||||
| None | 243 (75%) | – | – | – | – | – | |
| Any exposure, past 7 days | 83 (25%) | 0.8 (0.02 to 1.6) | 0.6 (-0.1 to 1.4) | −2.2 (−4.7 to 0.2) | −2.0 (−4.4 to 0.5) | 3.3 (0.2 to 6.5) | 2.8 (−0.4 to 6.0) |
| Baseline exposure, past 7 days | |||||||
| None | 243 (75%) | – | – | – | – | – | – |
| Lower exposure (1–2 h/week) | 49 (15%) | 0.07 (−0.9 to 1.0) | 0.07 (−3.0 to 2.9) | 0.3 (−2.7 to 3.2) | −0.07 (−3.0 to 2.9) | 1.5 (−2.3 to 5.3) | 1.7 (−2.1 to 5.5) |
| Higher exposure (≥3 h/week) | 34 (10%) | 1.8 (0.7 to 2.9) | 1.5 (0.4 to 2.6) | −5.8 (−9.3 to -2.3) | −4.9 (−8.4 to −1.3) | 6.0 (1.5 to 10.5) | 4.4 (−0.2 to 9.0) |
| Baseline ETS related sensory irritation‡ | |||||||
| None | 278 (85%) | – | – | – | – | – | – |
| Any eye or nose irritation | 48 (15%) | 0.7 (−0.3 to 1.6) | 0.4 (−0.5 to 1.4) | −4.9 (−7.9 to −1.9) | −4.0 (−7.0 to −1.0) | 6.3 (2.5 to 10.2) | 5.0 (1.2 to 8.9) |