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Table 2 β Coefficients and 95% CIs of each variable versus %FEV1 by model and population

From: Effect of smoking on lung function, respiratory symptoms and respiratory diseases amongst HIV-positive subjects: a cross-sectional study

  In all the subjects In smokers
  Model 1 # Model 2 ## Model 1 # Model 2 ##
Per 10 pack-years -0.021 (-0.036, -0.006)** -0.021 (-0.036, -0.006)** -0.020 (-0.042, 0.002) -0.020 (-0.042, 0.002)
Male 0.017 (-0.054, 0.088) Not assessed -0.034 (-0.144, 0.077) Not assessed
White 0.088 (0.012, 0.163)* 0.093 (0.020, 0.165)* 0.050 (-0.086, 0.187) 0.052 (-0.083, 0.188)
Restrictive lung diseases -0.167 (-0.270, -0.065)** -0.174 (-0.272, -0.077)** -0.133 (-0.309, 0.042) -0.121 (-0.290, 0.049)
  1. All the results were from the multiple linear regression analysis, in which the dependent variable was %FEV1. Pack-year of smoking was calculated by multiplying the number of packs of cigarette smoked per day and the number of years of smoking. Restrictive lung function was defined as FEV1/FVC ≥ 70% and %FVC < 80%, either before or after salbutamol inhalation.
  2. # In model 1, the association between %FEV1 and pack-years of smoking was adjusted for by gender, race and restrictive lung diseases. R2 = 0.210 in all the subjects and R2 = 0.084 in smokers.
  3. ## In model 2, the association between %FEV1 and pack-years of smoking was adjusted for by race and restrictive lung diseases. R2 = 0.209 in all the subjects and R2 = 0.080 in smokers.
  4. * p < 0.05 for β coefficient. **p < 0.01 for β coefficient.