Table 2

CATI response rates

Denominator

Response rate (denominator used in calculation)


Target households1

Control households2

All households3


Number of letters sent

31% (1700)

30% (1726)

30% (3426)


Number of letters sent to estimated eligible households*

34% (1522)

31% (1674)

33% (3196)


Number of households contacted by telephone

37% (1410)

36% (1444)

36% (2854)


Number of eligible households contacted by telephone

41% (1262)

37% (1401)

39% (2663)


1 523 completed CATI 2 514 completed CATI 3 1037 completed CATI

* = rate of eligibility of households contacted by telephone assumed to be the same for households not contacted by telephone

O'Toole et al. BMC Medical Research Methodology 2008 8:71   doi:10.1186/1471-2288-8-71

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