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Table 1 Baseline characteristics of study participants

From: Effects of Green Tea Catechins and Theanine on Preventing Influenza Infection among Healthcare Workers: A Randomized Controlled Trial

  Catechin/Theanine group Placebo group  
Characteristics (n = 97) (n = 99) P Value
Age, mean (SD) [range], y 42.1 (12.4) [21-65] 43.2 (13.1) [22-69] 0.63a
Sex, No. (%)    
   Male 21 (21.6) 23 (23.2)  
   Female 76 (78.4) 76 (76.8) 0.86b
BMI, mean (SD) [range] 21.6 (2.8) [15.9-30.9] 22.7 (3.2) [16.6-33.3] 0.01c
Vaccination for influenza virus, No. (%) 91 (93.8) 91 (91.9) > 0.99b
Hand-washingd, No. (%) 72 (74.2) 72 (72.7) 0.87b
Facemasksd, No. (%) 15 (15.5) 20 (20.2) 0.46b
Garglingd, No. (%) 71 (73.2) 68 (68.7) 0.53b
Smoking, No. (%)    
   Yes 29 (29.9) 29 (29.3)  
   Past 15 (15.5) 15 (15.2) > 0.99b
   No 53 (54.6) 55 (55.6)  
Alcohol consumption, No. (%)    
   Yes 49 (50.5) 56 (56.6)  
   Past 3 (3.1) 4 (4.0) 0.66b
   No 45 (46.4) 39 (39.4)  
Tea consumption, mean (SD), mL/day 494.3 (415.6) 481.3 (374.3) 0.95a
  1. Abbreviation: BMI, body mass index.
  2. a P value based on Wilcoxon rank sum test.
  3. b P value based on Fisher's exact test.
  4. c P value based on Student's t test
  5. d The preventive measures such as hand-washing, facemask application, or gargling was performed 4 days per week or more during the study period.