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Table 5 Comparison of factors affecting exposure levels in the underestimation and overestimation groups

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

Variables Overestimation group Underestimation group Others (true-assumed group)
Mean S.D. Mean S.D. Mean S.D.
Period (month) 69.8 40.1 15.4 14.3 25.0 21.6
Amount of use (mL) 27.5 32.2 14.8 8.7 14.6 12.2
Daily usage time (hr) 18.4 5.8 12.8 5.1 12.2 5.7
Usage time for sleeping (hr) 9.0 3.3 7.7 1.7 7.8 3.2
Indoor concentration (μg/m3) 1914.1 2401.2 771.6 665.5 647.0 690.7
Cumulative exposure time (hr) 34,548.6 22,997.0 5191.7 5667.3 7702.4 8185.3
Exposure level (μg/m3·hr) 49,483,924 74,191,015 3,552,275 3,657,695 4,473,117 5,260,741
  1. * S.D. standard deviation