Sample sizes of frequent and infrequent attenders, censoring and response rates to questionnaire.
| Frequent attenders | Infrequent attenders | |
|---|---|---|
| Primary sample | 2152 | 1478 |
| Died or changed addressa | 7 | 6 |
| Eligible sample | 1932b | 1472 |
| No addressc | 9 | 7 |
| Questionnaires sent to patients | 1923 | 1465 |
| Responses from patients | 1423 (74.0%) | 1103 (74.3%) |
| Number of valid questionnaires | 1222 (63.5%) | 989 (67.5%) |
↵a Just before or after the questionnaire was sent out.
↵b For 103 frequent attenders the GP stated that the patient should not be sent a questionnaire. Thirteen GPs did not want to continue after the first round, and the 117 sampled frequent attenders were therefore excluded.
↵c Unknown/incorrect address in the Centralised Civil Register.