© 1994 Oxford University Press
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The Natural History of Prostatism: The Effects of Non-Response Bias
* Sections of Clinical Epidemiology, Mayo Clinic Rochester, MN, USA
** Medical Information Resources Mayo Clinic Rochester, MN, USA
Epidemiology, Merck Research Laboratories Blue Bell, PA, USA
Biostatistics, Department of Health Sciences Research, Mayo Clinic Rochester, MN, USA
§ Department of Urology, Mayo Clinic Rochester, MN, USA
Reprint requests to: Steven J Jacobson, Department of Health Sciences Research, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
BACKGROUND: In epidemiological studies, non-response may raise the question of generalizabllity to the target population. Most investigations have not been able to access data that could provide information about the potential impact of non-response bias.
METHODS: A 55% response rate was realized at baseline for a prospective cohort investigation of the natural history of benign prostatic hyperplasia in Olmsted County, Minnesota, during 1989–1991 (the Olmsted County Study of Urinary Symptoms and Health Status Among Men). This prompted a preliminary study of potential non-response bias among full participants, partial participants and complete non-responders. The medical diagnostic index maintained by the Rochester Epidemiology Project was used to ascertain the prevalence of specific conditions in the 9 years prior to study inception.
RESULTS: The age-adjusted period prevalence rate for benign prostatic hyperplasia (%) was 9.6 (95% confidence interval [Cl] 8.1–11.0) for full participants, 8.2 (95% Cl: 5.8–10.6) for partial participants and 5.3 (95% Cl: 3.6–6.9) for complete non-responders. Other urologic diagnoses followed the same pattern. However, age-adjusted prevalence rates for general medical examination history and major non-urologlc morbidities were decidedly similar across response groups.
CONCLUSIONS: These data suggest response may have been driven, in part, by concerns about urologic disease However, the similarity in non-urologlc diagnoses and general medical examinations provide some preliminary reassurance that the 55% response rate did not necessarily compromise generalizability.
Received 1 April 1994
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