Short Case Studies
Tow short case studies – one with a larger sample size, one with a
small sample size – showing sampling method, sample size and response
rates are below.
| Sampling Frame |
GP registration list from
Kent Primary Care Agency |
| Sampling Method |
Random – one-in-fifty of
population |
| Data Collection |
Postal Survey. 3 Reminders:
post card at 4 weeks, additional questionnaire at 6 weeks,
additional postcard at 8 weeks. The survey was also available
online – very few people responded this way. |
| Sample Size |
22,861 aged 16+ |
| Total returns |
5,800 |
| Achieved response |
27% |
| Best response
rates were achieved from people in their middle years, with
younger people, especially men under 45, being less likely to
complete the questionnaire |
| Sampling Frame |
Patient and Practitioner
Services Authority (PSA) register (residents registered with a
GP). |
| Sampling Method |
Stratified random sampling. |
| Data Collection |
Postal, 2 reminders including
questionnaires. |
| Sample Size |
5,020 residents aged 16+ (in
2 phases). |
| Target |
100 returns in each of 16
wards. |
| Total returns |
1,777 |
| Achieved response |
38% |
| Response gives
city-wide estimates to within +/- 2.3% (95% confidence level)
Response also allows analysis for priority areas within the
city. |
|
