Table 3

Gas stove exposure and respiratory symptoms among adults with asthma participating in NHANES III

Respiratory symptomProportion reporting symptomOdds ratio (95% CI)
Age, gender, and race-ethnicitySocioeconomic indicators and smoking history*Housing and geographic factors†
*Socioeconomic indicators: educational attainment and poverty-income ratio.
†Housing and geographic factors: age of home (<1946, 1946–73, 1974+, or unknown), urban versus rural location, geographic location (northeast, south, midwest, west), residence with ⩾1 smokers (versus none), gas heating system (versus other fuel).
Results based on logistic regression analysis. Results in each column also control for covariates in previous column.
Cough
    Usual cough for ⩾3 mth/y16%0.8 (0.4 to 1.7)0.8 (0.3 to 1.7)1.1 (0.6 to 2.1)
Phlegm production
    Usually brings up phlegm ⩾3 mth/y13%0.7 (0.3 to 1.7)0.7 (0.3 to 1.6)0.7 (0.3 to 1.8)
Dyspnoea
    Hurrying to level ground or walking uphill45%1.4 (0.8 to 2.6)1.4 (0.8 to 2.6)1.4 (0.8 to 2.7)
Wheeze
    Any time during past 12 months67%1.5 (0.7 to 3.201.6 (0.8 to 3.4)1.6 (0.7 to 3.4)
Any respiratory symptom80%1.5 (0.7 to 3.3)1.6 (0.8 to 3.2)1.7 (0.7 to 3.7)