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Table 2 Cluster characteristics, and outcome data from the total study period, weeks 7-74 (a total of 68 weeks), as well as from the first part of the study prior to the influenza A/H1N1 pandemic for the infection proportion (no. of infection episodes/reported weeks).

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

Random. set and triplet Arm and cluster code Total staff number Relative infection risk sum Initial number of particip. Soap or disinfectant usage per participant Number of reported weeks Median coverage% of weeks No. of infection episodes Infection proportion, whole study Infection proportion, before the pandemic Sick leave proportion Absence proportion
I/A IR2 12 160 35 52 5.3 2997 89.5 305 0.102 0.113 0.037 0.040
  IR1 16 100 39 48 7.5 2515 89.7 195 0.078 0.095 0.029 0.030
  C 26 80 45 22 nr 1159 88.9 111 0.096 0.096 0.054 0.057
I/B C 15 100 45 36 nr 1740 73.6 122 0.070 0.083 0.026 0.037
  IR2 14 100 47 12 15.8 648 76.9 72 0.111 0.111 0.045 0.057
  IR1 13 160 50 57 9.2 3544 83.1 443 0.125 0.115 0.072 0.078
I/C IR2 24 76 51 25 8.1 1537 89.1 263 0.171 0.170 0.034 0.051
  IR1 20 50 55 12 2.8 645 91.7 55 0.085 0.110 0.029 0.029
  C 25 96 57 27 nr 1248 73.9 174 0.139 0.185 0.036 0.043
I/D IR2 21 50 57 16 7.5 1132 86.4 102 0.090 0.087 0.027 0.034
  C 22 50 65 20 nr 1174 94.7 133 0.113 0.135 0.035 0.040
  IR1 18 82 72 31 5.1 1807 96.3 131 0.072 0.061 0.031 0.032
II/A IR2 6 118 41 37 5.4 2078 86.1 213 0.103 0.096 0.037 0.045
  C 3 150 50 50 nr 2690 89.2 313 0.116 0.127 0.031 0.037
  IR1 10 123 58 54 3.9 3167 91.7 312 0.099 0.094 0.041 0.055
II/B IR2 5 110 68 33 7.1 2079 97.1 194 0.093 0.080 0.031 0.047
  IR1 7 45 69 23 6.2 1370 91.3 105 0.077 0.075 0.034 0.039
  C 2 150 70 33 nr 1841 88.1 184 0.100 0.095 0.037 0.043
II/C IR2 9 100 86 27 6.3 1515 85.2 139 0.092 0.087 0.035 0.050
  C 8 160 87 36 nr 1792 82.4 177 0.099 0.096 0.033 0.041
  IR1 4 80 104 32 1.3 1966 91.3 210 0.107 0.105 0.024 0.034
Total IR1 640 903 257 6.1 15014 89.5 1451 0.097 0.096 0.037 0.043
  IR2 714 774 202 6.9 11986 89.0 1288 0.107 0.108 0.035 0.046
  C 786 851 224 nr 11644 83.8 1214 0.104 0.115 0.036 0.043
  1. Totals in the three last lines were calculated from the cluster means.