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Table 3 Impact of ever WS exposure on lung function decline independent of current smoking, airway obstruction, and CMH status at baselinea

From: Wood smoke exposure affects lung aging, quality of life, and all-cause mortality in New Mexican smokers

Model FEV1 (ml/s) FEV1/FVC ratio (%)
Basic model   
 WS exposure × years − 4.3 (1.9) − 0.094 (0.038)
 P value 0.024 0.015
Basic model + current smoker × years   
 WS exposure × years − 4.1 (1.9) − 0.088 (0.038)
 P value 0.033 0.021
 Current smoker × years − 4.4 (1.7) − 0.101 (0.033)
 P value 0.0082 0.0026
Basic model + airway obstruction × years   
 WS exposure × years − 4.3 (1.9) − 0.094 (0.039)
 P value 0.025 0.016
 Airway obstruction × years − 2.9 (1.9) − 0.113 (0.039)
 P value 0.14 0.0041
Basic model + CMH × years   
 WS exposure × years − 4.0 (1.9) − 0.088 (0.038)
 P value 0.038 0.022
 CMH × years − 5.4 (2.0) − 0.097 (0.040)
 P value 0.0061 0.014
Basic model + current smoker × years + airway obstruction × years + CMH × years   
 WS exposure × years − 3.7 (1.9) − 0.080 (0.037)
 P value 0.050 0.034
 Current smoker × years − 3.9 (1.9) − 0.102 (0.034)
 P value 0.023 0.0026
 Airway obstruction × years − 7.2 (2.0) − 0.279 (0.038)
 P value 0.0002  < 0.0001
 CMH × years − 3.1 (2.1) − 0.024 (0.041)
 P value 0.13 0.56
  1. CMH chronic mucous hypersecretion, WS woodsmoke
  2. aLinear mixed effects model was used to assess the impact of ever WS exposure on lung function decline through including an interaction term between ever WS exposure and time in cohort (years). We included fixed effects for baseline age, BMI, height, smoking stats, and packyears, sex, and ethnicities, and random effects for intercept and time in cohort. Interactions terms for current smoking, airway obstruction, and CMH at baseline with time in cohort were added to test the independent components of ever WS exposure effects on decline of FEV1 and FEV1/FVC ratio. WS exposure, airway obstruction, and CMH were coded as binary variables. Time in cohort has year as the unit