Can physician's self-estimates be used as a valid instrument to determine prescription frequencies of anti-psoriatic drugs? Comparison of the results of a cross-sectional study using self-estimates with actual prescription behavior documented in a cohort study
Version of Record online: 17 MAY 2013
Copyright © 2013 John Wiley & Sons, Ltd.
Pharmacoepidemiology and Drug Safety
Volume 22, Issue 11, pages 1154–1158, November 2013
How to Cite
Nast, A., Rosumeck, S., Erdmann, R. and Werner, R. N. (2013), Can physician's self-estimates be used as a valid instrument to determine prescription frequencies of anti-psoriatic drugs? Comparison of the results of a cross-sectional study using self-estimates with actual prescription behavior documented in a cohort study. Pharmacoepidem. Drug Safe., 22: 1154–1158. doi: 10.1002/pds.3453
- Issue online: 21 OCT 2013
- Version of Record online: 17 MAY 2013
- Manuscript Accepted: 26 MAR 2013
- Manuscript Revised: 13 MAR 2013
- Manuscript Received: 8 AUG 2012
- evaluation studies;
- drug prescriptions;
Physicians' self-estimates of their own prescription behavior can be used as a tool to gather information on prescription frequencies. Self-estimates as a tool for health-care research on prescription frequencies need to be validated as a suitable method before it can be used widely.
We performed a cross-sectional study inviting all dermatologists in Berlin and Brandenburg to give self-estimates of their own prescription behavior of anti-psoriatic drugs. The results were compared with the results from a consecutive 8-months cohort study with the same participants documenting their actual treatment choices during every visit of a psoriasis patient on a standardized documentation sheet. Differences between self-estimates and documented prescription patterns were analyzed with respect to systemic anti-psoriatic drugs and UV treatment.
Fifty-one dermatologists participated. They documented an average of 91 patient visits each. Absolute differences between the self-estimates and the documented actual prescription behavior ranged from −2.5% to 1.4% for systemic treatments. For psoralen plus ultravioloet A (PUVA) treatment, the absolute difference was 3.3% and for ultraviolet B (UVB) 4.7%.
Self-estimates were surprisingly exact. Self-estimates may be suggested as one tool to assess prescription frequencies, but further studies are needed to confirm their validity. Copyright © 2013 John Wiley & Sons, Ltd.