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Table 4 CATI versus Diary responses: Toilet flushing

From: Collecting household water usage data: telephone questionnaire or diary?

Statistic Total number of toilet flushes per household per week CATI response relative to Diary
  CATI response
(Median 95% confidence limit)
Diary response
(Median 95% confidence limit)
weighted kappa
(agreement*)
Average 112.4 91.8  
Standard deviation 60.5 40.1  
Median 105
(96 - 112)
85
(77 - 90)
0.29
(poor)
N 216 216  
  1. * Fleiss JL: Statistical methods for rates and proportions 2nd edition, New York; Wiley; 1981:218
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