Skip to main content

Table 3 CATI versus Diary responses: Laundry

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

Statistic Number of washing machine loads per week CATI response relative
  CATI response
(Median 95% confidence limit)
Diary response
(Median 95% confidence limit)
to Diary
weighted kappa
(agreement*)
Average 5.3 6.7  
Standard deviation 3.1 3.7  
Median 5
(4 - 5)
6
(5.5 - 7)
0.66
(fair to good)
N 217 217  
  1. * Fleiss JL: Statistical methods for rates and proportions 2nd edition, New York; Wiley; 1981:218
\