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Table 3 Outcome measures in different study periods.

From: Hand washing with soap and water together with behavioural recommendations prevents infections in common work environment: an open cluster-randomized trial

OUTCOME MEASURE INTERVENTION ARM BEFORE THE PANDEMIC DURING AND AFTER THE PANDEMIC TOTAL FOLLOW-UP TIME
INFECTION EPISODES/REPORT WEEKS IR1 0.096 (p = 0.002 vs. C) 0.097 0.097 (p = 0.04 vs. C)
  IR2 0.108 0.107 0.107
  CONTROL 0.115 0.098 (p = 0.005 vs. before pandemic) 0.104
RESPIRATORY INFECTION EPISODES/REPORT WEEKS IR1 0.074 (p = 0.01 vs. C) 0.078 0.076
  IR2 0.084 0.085 (p = 0.03 vs. C) 0.085
  CONTROL 0.088 0.075 0.080
GASTROINTESSINAL INFECTION EPISODES/REPORT WEEKS IR1 0.015 0.011 0.012 (p = 0.03 vs. C)
  IR2 0.017 0.015 0.016
  CONTROL 0.018 0.015 0.016
SICK LEAVE EPISODES/REPORT WEEKS IR1 0.031 0.047 0.042
  IR2 0.027 0.039 0.035
  CONTROL 0.030 0.038 (p = 0.003 vs. IR1) 0.035 (p = 0.004 vs. IR1)
ABSENCE EPISODES/REPORT WEEKS IR1 0.038 0.054 0.048
  IR2 0.036 0.050 0.045
  CONTROL 0.038 0.044 (p = 0.003 vs. IR1) 0.042 (p = 0.009 vs. IR1)
  1. Numbers represent proportions calculated from the number of reported episodes in a trial arm per total reported weeks. Proportions can be converted to episodes per person year by multiplying by 52. Statistically significant differences indicating efficacy of the intervention are shown in bold face.