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Table 4 Predictors of absolute FEV1 level and FEV1/FVC (%): in a multiple linear regression modela

From: Second-hand smoke and chronic bronchitis in Taiwanese women: a health-care based study

Variables    Adjusted analysis   Adjusted analysis
  N FEV1 (L) (mean ± SD) β(SE) p-value FEV1/FVC (%)(mean ± SD) β(SE) p-value
Age 417 1.56 ± 0.46 -0.022 (0.002) <0.01 81.10 ± 15.59 -0.134 (0.090) 0.14
Height 417   0.021 (0.004) <0.01   0.421 (0.146) <0.01
Education levels        
   ≥junior high school 71 1.80 ± 0.41 1   80.94 ± 14.79 1  
   primary school 225 1.59 ± 0.46 -0.044 (0.053) 0.41 81.04 ± 15.79 1.820 (2.142) 0.4
   illiteracy 121 1.37 ± 0.40 -0.079 (0.063) 0.21 81.32 ± 15.79 3.068 (2.554) 0.23
Cigarette smoking and cumulative SHS exposure year        
   Non-smoker 131 1.60 ± 0.41 1   86.83 ± 12.57 1  
   Second-hand smoker        
1 < SHS < 32 131 1.63 ± 0.47 -0.095 (0.046) 0.04 80.70 ± 14.75 -5.807 (1.900) <0.01
SHS ≥ 32 129 1.51 ± 0.47 -0.113 (0.046) 0.01 77.07 ± 16.86 -9.436 (1.869) <0.01
   Smoker 26 1.29 ± 0.50 -0.246 (0.079) <0.01 74.24 ± 18.18 -11.592 (3.226) <0.01
Burning incense        
   no 182 1.63 ± 0.47 1   81.70 ± 15.57 1  
   yes 235 1.51 ± 0.44 -0.091 (0.037) 0.02 80.64 ± 15.62 -1.654 (1.523) 0.28
Cooking status        
   no 17 1.56 ± 0.48 1   83.80 ± 15.69 1  
   yes 400 1.56 ± 0.46 0.012 (0.094) 0.9 80.99 ± 15.59 -2.243 (3.805) 0.56
  1. aThree subjects did not have complete lung function test information.