title: Accuracy and consistency of quadratic odds estimates.
abstract: In medical practices that do not have rosters, only the number of patients who come to the practice can be enumerated: the number who might have visited if they had had a reason to do so remains unknown. The Quadratic Odds Estimator is a technique for estimating the total number of patients cared for by a primary care medical practice, including the non-visitors. A revised version of the model is shown to have an error of less than 1% in predicting the number of patients at risk of visiting a primary care medical practice. Aggregate and sex-specific estimates of total practice size are shown to be comparable to within 2%. The model estimates the prevalence of hypertension among the patients of two family practice resdencies as 18 and 11%. The rationale for employing unconventional regression weights and dual regressions is explained.
authors.affiliation: Department of Family Practice, College of Human Medicine, Michigan State University, East Lansing 48824.
authors.forename: B W
authors.initials: BW
authors.lastname: Smith
mesh_terms: D005194:Family Practice; D005260:Female; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D008297:Male; D008824:Michigan / Q000453:epidemiology; D015233:Models, Statistical; D016017:Odds Ratio; D009819:Office Visits; D009864:Ontario; D011336:Probability; D012044:Regression Analysis; D012307:Risk Factors