Table 2

Gas stove exposure and pulmonary function among adults with asthma participating in NHANES III

Pulmonary function measurementChange in mean pulmonary function value (95% CI)*, adjusting for:
Age, gender, height, and race-ethnicitySocioeconomic indicators and smoking history†Housing and geographic factors‡
*Residual values calculated as observed minus expected values. Expected values derived from Hankinson equations based on age, gender, race-ethnicity (white, African-American, Mexican American), and height. First column shows association between gas stove use and mean increase or decrease in each pulmonary function measurement, adjusted using predictive equations. Second and third columns also control for additional covariates in multivariate linear regression models. See methods for further analysis details.
†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 linear regression analysis. Results in each column also control for covariates in previous column.
FEV1 (ml)146 (−50 to 342)136 (−59 to 331)136 (−46 to 317)
FVC (ml)0 (−151 to 152)−8.7 (−152 to 135)30 (−109 to 170)
FEV1/FVC ratio (%)4.1 (0.47 to 7.63)3.96 (0.33 to 7.59)3.62 (0.40 to 6.84)
FEF25%–75%357 (−7 to 722)345 (−30 to 719)307 (−50 to 665)