Table 2 Strategies to improve questionnaire response: Cost-effectiveness
No internet option & Double-sided | Internet option & Double-sided | No internet option & Single-sided | Internet option & Single-sided | |
|---|---|---|---|---|
Response rate (in %) | 35.5 | 34.3 | 35.8 | 39.4 |
Nr. of respondents | 393 | 382 | 387 | 442 |
Nr. of eligible participants | 1106 | 1082 | 1113 | 1116 |
Cost per response (£) | 6.64 | 8.59 | 7.67 | 8.36 |
Cost per additional response (£) | -- | -- | 119.19 | 25.20 |