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Table 5 Changes in pulmonary function during work

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

   All subgroups
(N = 58)
Withering subgroup
(N = 39)
Ball-rolling subgroup
(N = 19)
FVC % -3.64 -3.33 -4.26
  p* < 0.01 < 0.01 < 0.01
  p**   0.59  
FEV1 % -4.71 -4.05 -6.05
  p* < 0.01 < 0.01 < 0.01
  p**   0.28  
FEV1/FVC % -1.11 -0.74 -1.87
  p* 0.04 0.24 0.05
  p**   0.36  
MMF % 0.50 0.08 1.38
  p* 0.34 0.42 0.62
  p**   0.84  
  1. *p values for paired t tests in comparison with the baseline values
  2. **p values for two-sample t tests between the withering group and the ball-rolling group
  3. FVC forced vital capacity, FEV1 1-second forced expiratory volume, MMF maximal mid-expiratory flow rate