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Table 1 Demographic characteristics and baseline pulmonary function in the tea worker and comparison groups

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

Characteristics Tea Workers (N = 91) Comparison (N = 32) p
Age (year) (mean ± SD) 40.6 ± 10.4 41.1 ± 9.1 0.81
Height (cm) (mean ± SD) 167.7 ± 6.3 169.5 ± 5.1 0.15
Weight (kg) (mean ± SD) 67.2 ± 8.1 69.6 ± 8.2 0.14
Education level*    < 0.01
   Elementary 18 (19.8%) 0 (0.0%)  
   Junior high 27 (29.7%) 0 (0.0%)  
   Senior high 45 (49.5%) 26 (81.3%)  
   University 1 (1.1%) 6 (18.7%)  
Race    0.80
   Han 83 (91.2%) 30 (93.8%)  
   Aboriginal 7 (7.7%) 2 (6.2%)  
   Hakka 1 (1.1%) 0 (0.0%)  
Smoking    0.86
   Never 31 (34.1%) 10 (31.2%)  
   Ex-smoker 16 (17.6%) 7 (21.9%)  
   Current 44 (48.3%) 15 (46.9%)  
Tea-drinking*    < 0.01
   Never 3 (3.3%) 8 (25.0%)  
   Occasional 22 (24.2%) 11 (34.4%)  
   Habitual 66 (72.5%) 13 (40.6%)  
Baseline pulmonary function    
   FVC (L) (mean ± SD) 4.05 ± 0.68 4.15 ± 0.58 0.41
   FVC (%pred) (mean ± SD) 89.10 ± 10.38 89.42 ± 7.27 0.85
   FEV1 (L) (mean ± SD) 3.66 ± 0.64 3.77 ± 0.59 0.39
   FEV1 (%pred) (mean ± SD) 97.47 ± 12.63 98.30 ± 9.47 0.70
   FEV1/FVC (mean ± SD) 90.47 ± 4.81 90.60 ± 4.67 0.90
   MMF (L/S) (mean ± SD) 4.93 ± 1.29 4.99 ± 1.12 0.79
   MMF (%pred) (mean ± SD) 123.78 ± 30.37 123.44 ± 23.73 0.95
  1. *p value < 0.05 for two-sample t test, chi-square test, or Fisher's exact test
  2. FVC: forced vital capacity, FEV1: 1-second forced expiratory volume, MMF: maximal mid-expiratory flow rate; pred = predicted value