Table 1

Household recruitment results for recycled water exposure study

Parameter

Target (recycled water) households

Control (drinking water only) households


Total number of households

16,000 (approx)

Unlimited


Households in the delimited AEC sampling frame

13,940

10,097


Households randomly selected from delimited electoral sampling frame for data matching with EWP database

3500

3500


Households with listed EWP telephone number

1995

1869


Number of introductory letters sent (pilot study)

295

143


Number of introductory letters sent*

1700

1726


Number of households successfully contacted by telephone*

1410

1444


Number of eligible# households successfully contacted by telephone*

1262

1401


Households with an invalid telephone number*

72

66


Number of completed interviews*

523

514


AEC = Australian Electoral Commission EWP = Electronic White pages

* = main study

# Eligibility = persons of 18 years of age or older, residing in single housing units within suburbs of interest with sufficient command of English. For the target households an additional eligibility criterion was supply of recycled water

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

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