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Table 1 Baseline characteristics of student participants across study arms, Hamilton, Canada, 2010 and 2011

From: Vitamin D3and gargling for the prevention of upper respiratory tract infections: a randomized controlled trial

  Vitamin D & gargling(N = 150) Vitamin D & No gargling (N = 150) Placebo & gargling (N = 150) Placebo & No gargling (N = 150)
Age, median years (IQR) 19 (18-20) 19 (18-21) 19 (18-20) 19 (18-21)
Female, No. (%) 96 (64.0) 97 (64.7) 100 (66.7) 89 (59.3)
Living in residence, No. (%) 48 (32.0) 50 (33.3) 50 (33.3) 49 (32.7)
Asthma, No. (%) 14 (9.3) 16 (10.7) 16 (10.7) 12 (8.0)
≥ 7 Hours sleep, No. (%) 114 (76.0) 102 (68.0) 111 (74.0) 116 (77.3)
Exercise, mean hours (SD) 5.1 (4.2) 4.9 (3.5) 4.8 (4.9) 4.8 (4.0)
Hand washing before meals, No.(%)     
Never 34 (22.7) 30 (20.0) 36 (24.0) 42 (28.0)
Usually 75 (50.0) 71 (47.3) 68 (45.3) 70 (46.7)
Always 40 (26.7) 45 (30.0) 42 (28.0) 35 (23.3)
Smoking, No. (%)     
Occasionally 6 (4.0) 5 (3.3) 6 (4.0) 6 (4.0)
Daily 0 1 (0.7) 2 (1.3) 4 (2.7)
Vitamin use, No. (%) 30 (20.0) 40 (26.7) 34 (22.7) 21 (14.0)
Daily gargling, No. (%) 15 (10.0) 19 (12.7) 18 (12.0) 8 (5.3)
  1. SD: Standard deviation, No: Number.