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Table 4 Multiple regression analyses of pulmonary function data

From: Pulmonary function, respiratory symptoms, and dust exposures among workers engaged in early manufacturing processes of tea: a cohort study

Variable FVC (L) FEV 1(L) FEV1/FVC (%) MMF (L/S)
  Beta [SE] p Bet [SE] p Beta [SE] p Beta [SE] p
Model 1: by work tasks         
Task#         
WP vs. W 0.122 [0.166] 0.47 0.113 [0.165] 0.50 -0.148 [1.476] 0.92 -0.202 [0.392] 0.61
WPB vs. W 0.267 [0.182] 0.15 0.204 [0.180] 0.26 -1.341 [1.614] 0.41 -0.022 [0.429] 0.96
B vs. W 0.129 [0.185] 0.49 -0.084 [0.183] 0.65 -5.200 [1.640] < 0.01 -0.845 [0.436] 0.05
Age (year) -0.028 [0.006] < 0.01 -0.029 [0.006] < 0.01 -0.099 [0.053] 0.07 -0.061 [0.014] < 0.01
Height (cm) 0.046 [0.010] < 0.01 0.033 [0.010] < 0.01 -0.216 [0.087] 0.01 -0.013 [0.023] 0.57
Weight (Kg) -0.001 [0.007] 0.94 0.003 [0.007] 0.71 0.065 [0.063] 0.30 0.012 [0.017] 0.37
Smoking         
   Ex-smoker vs. Never 0.007 [0.163] 0.97 -0.013 [0.161] 0.94 -0.446 [1.442] 0.76 0.158 [0.383] 0.68
   Current vs. Never -0.111 [0.122] 0.36 -0.139 [0.120] 0.25 -1.007 [1.079] 0.35 -0.195 [0.287] 0.50
Tea-drinking         
   Occasional vs. Never 0.170 [0.302] 0.57 0.208 [0.299] 0.49 1.257 [2.677] 0.64 -0.007 [0.711] 0.99
   Habitual vs. Never 0.300 [0.294] 0.31 0.225 [0.291] 0.44 -1.091 [2.609] 0.68 -0.521 [0.693] 0.45
Annual work duration (month) 0.001 [0.003] 0.64 0.002 [0.003] 0.41 0.035 [0.027] 0.20 0.016 [0.007] 0.03
Model 2: by dust level         
Coarse fraction 0.033 [0.070] 0.64 -0.073 [0.070] 0.30 -2.612 [0.615] < 0.01 -0.332 [0.166] 0.04
Respirable dust -0.190 [0.466] 0.68 -0.265 [0.463] 0.57 -2.739 [4.069] 0.50 -0.612 [1.099] 0.58
Age (yea) -0.028 [0.006] < 0.01 -0.030 [0.006] < 0.01 -0.104 [0.053] 0.05 -0.062 [0.014] < 0.01
Height (cm) 0.045 [0.010] < 0.01 0.032 [0.010] < 0.01 -0.230 [0.087] 0.01 -0.016 [0.024] 0.49
Weight (Kg) -0.001 [0.007] 0.88 0.002 [0.007] 0.76 0.067 [0.062] 0.29 0.014 [0.017] 0.42
Smoking         
   Ex-smoker vs. Never 0.046 [0.162] 0.77 0.032 [0.161] 0.84 -0.241 [1.416] 0.87 0.163 [0.382] 0.67
   Current vs. Never -0.086 [0.120] 0.47 -0.112 [0.119] 0.35 -0.912 [1.046] 0.39 -0.208 [0.283] 0.46
Tea-drinking         
   Occasional vs. Never 0.134 [0.302] 0.66 0.170 [0.301] 0.57 1.166 [2.643] 0.66 -0.026 [0.714] 0.97
   Habitual vs. Never 0.270 [0.295] 0.36 0.198 [0.293] 0.50 -1.054 [2.574] 0.68 -0.520 [0.696] 0.46
Annual work duration (month) 0.002 [0.003] 0.57 0.003 [0.003] 0.34 0.038 [0.026] 0.15 0.016 [0.007] 0.03
  1. FVC forced vital capacity, FEV1 1-second forced expiratory volume, MMF maximal mid-expiratory flow rate; SE standard error; # W withering, WP Withering + Panning, WPB Withering + Panning + Ball-Rolling, B Ball-Rolling