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Table 4 Treatment completion* among current cigarette smokers and non-smokers in the crossover tea study

From: A six-month crossover chemoprevention clinical trial of tea in smokers and non-smokers: methodological issues in a feasibility study

  Smokers Non-smokers
  Total Completed Dropped out Total Completed Dropped out
  (n) n (%) n (%) (n) n (%) n (%)
Treatment number       
1b 32 20 (62) 12 (38) 33 27 (82) 6 (18)
2 20 16 (80) 4 (20) 27 24 (89) 3 (11)
3 16 13 (81) 3 (19) 24 22 (92) 2 (8)
4 13 11 (85) 2 (15) 22 21 (95) 1 (5)
Treatment type       
Green tea 18 13 (72) 5 (28) 27 24 (89) 3 (11)
Black teaa 22 14 (63) 8 (37) 24 23 (96) 1 (4)
Caffeinated water 20 17 (85) 3 (15) 28 24 (86) 4 (14)
Placebo 21 16 (77) 5 (23) 27 21 (85) 6 (15)
  1. a P value <0.05 for difference in proportions between smokers and non-smokers.
  2. b 0.05 ≤ P value < 0.10 for difference in proportions between smokers and non-smokers.
  3. c 0.10 ≤ P value < 0.15 for difference in proportions between smokers and non-smokers.
  4. * Treatment completion is defined as completion of all four crossover treatments.
  5. Treatment number represents the number of the assigned crossover treatment. For e.g., treatment number 1 is the first assigned treatment after the run-in period.