Publication

Birth cohort appeared to confound effect estimates of guideline changes on statin utilization

Bijlsma, M. J., Janssen, F., Lub, R., Bos, J. H. J., De Vries, F. M., Vansteelandt, S. & Hak, E., Mar-2015, In : Journal of Clinical Epidemiology. 68, 3, p. 334-340 7 p.

Research output: Contribution to journalArticleAcademicpeer-review

Copy link to clipboard

Documents

  • Birth cohort appeared to confound effect estimates of guideline changes on

    Final publisher's version, 390 KB, PDF document

    Request copy

DOI

Objectives: To investigate how birth cohorts can confound population-based intervention effect estimates.

Study Design and Setting: Interrupted time series design was applied to study the prevalence of statin use in Dutch diabetes patients over the period 1998-2011. Effects of guideline changes on the outcome were estimated using a Poisson regression model with and without the birth cohort dimension modeled through random intercepts.

Results: Both models estimated a stronger increase in prevalence of statin use after influential studies were published in 2003 for patients aged below 50 and above 70 years. The model that controlled for birth cohort also estimated an effect for patients aged 50-70 years from 2003 onward. The magnitude of the intervention effect for patients aged above 70 years when we controlled for birth cohort was reduced from 0.078 [95% confidence interval (CI): 0.065, 0.091] to 0.027 (95% CI: 0.013, 0.041). Similarly, for patients aged below 50 years, the estimated guideline effect was reduced from 0.070 (95% CI: 0.048, 0.092) to 0.055 (95% CI: 0.035, 0.075).

Conclusion: In this case study, the birth cohort dimension appeared to confound population-level effect estimates of guideline changes on prevalence of statin use in patients with diabetes. (C) 2015 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)334-340
Number of pages7
JournalJournal of Clinical Epidemiology
Volume68
Issue number3
Publication statusPublished - Mar-2015

    Keywords

  • Birth cohort , Diabetes, Effect estimation, Confounding, Statins

View graph of relations

ID: 15610438