N = 664* | Baseline | 2 weeks | After step 1 | After step 2# | After step 3# | 6 months | 1 year |
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Sent out | 664* | 613* | 643* | 595* | 587* | 659* | 566* |
Returned | 629 | 543 | 525 | 474 | 454 | 646 | 373 |
Response rate | 95% | 86% | 82% | 80% | 77% | 98% | 66%^ |
- * Not all follow-up questionnaires were sent out, for instance when patients started step 2 within 2 weeks, or patients reported they no longer whish to receive questionnaires.
- # if medication of this step was not started, questionnaires were sent out at 2 resp. 3 months.
- ^In case of non-response a reminder is sent out after all questionnaires except after 1-year, since this is an additional measurement to the original research protocol. This explains the low response rate.