Table 2

Guessing treatment on the first day

PlaceboZinc lozenge
Guessed placebo57
Guessed zinc810
No guess2926
  • Two participants of the zinc lozenge group are not included since they were unable to fill the web-based questionnaire. We tested if treatment and guessing were independent on lines 2 and 3 (p=0.9 in the χ2 test).