From: Maximising response rates in household telephone surveys
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 |