Abstract #301045

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JSM 2003 Abstract #301045
Activity Number: 133
Type: Contributed
Date/Time: Monday, August 4, 2003 : 12:00 PM to 1:50 PM
Sponsor: Biometrics Section
Abstract - #301045
Title: Patterns of Physician Visits for Asthma
Author(s): Peter C. Wollan*+ and Barbara Yawn
Companies: Mayo Clinic and Olmsted Medical Center
Address: 1701 10th St. NE, Rochester, MN, 55906-7165,
Keywords: longitudinal data ; hazard rate
Abstract:

The longitudinal progression of asthma is complex and not well understood, but recent work has described several distinct types or subclasses of the disease, based on age at onset, severity, and periods of remission or inactivity. One such classification, due to Martinez, distinguishes infant onset, preschool onset, and adolescent onset asthma. We have modeled this framework using a piecewise constant hazard rate for time to an asthma-related physician visit; our data consist of all asthma-related physician visits, identified through administrative records, for a cohort of school-age children. Hazard rates were fit for each child, and the vectors of coefficients were examined for clusters. Our results did not identify distinct subgroups of children, but instead were consistent with a view of asthma as having smooth ranges for age at onset, severity, and frequency of physician contact.

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