Skip to main content

Table 3 Cross-tabulation between clinical classes and exposure ratings

From: Misclassification and characterization of exposure to humidifier disinfectants using a questionnaire

   Clinical class Total p-value
Class 1 Class 2 Class 3 Class 4
Indoor concentration Rating 1 2406 172 134 157 2869 0.04
Rating 2 165 12 10 19 206
Rating 3 137 16 7 13 173
Rating 4 169 9 8 22 208
Cumulative exposure time Rating 1 2339 186 144 200 2869 < 0.01
Rating 2 188 7 6 5 206
Rating 3 159 6 5 3 173
Rating 4 191 10 4 3 208
Exposure level Rating 1 2357 181 143 188 2869 < 0.01
Rating 2 166 15 12 13 206
Rating 3 162 2 0 9 173
Rating 4 192 11 4 1 208
  Total 2877 209 159 211 3456