| 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. (%) | Â | Â | Â |
   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. (%) | Â | Â | Â |
   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. (%) | Â | Â | Â |
   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 |