Membership duration and utilization rates in a prepaid group practice

Area of Science:

• Health Services Research
• Healthcare Management
• Health Economics

Background:

• Prepaid group practices (PGP) are a key component of healthcare delivery.
• Understanding member utilization patterns is crucial for financial planning and policy development.
• The "start-up effect" in PGP membership duration and its impact on utilization require further investigation.

Purpose of the Study:

• To investigate the relationship between the duration of membership in a prepaid group practice and healthcare utilization rates.
• To identify the presence and extent of a "start-up effect" on utilization over a five-year period.
• To analyze how this effect varies across different socioeconomic groups, employers, and cohorts.

Main Methods:

• Longitudinal study design analyzing utilization data over a 5-year period.
• Inclusion of a developing prepaid group practice in urban St. Louis.
• Stratified analysis across various demographic and socioeconomic subgroups (sex, race, income, education, age), employers, and cohorts.

Main Results:

• A substantial reduction in utilization rates was observed as membership duration increased over the 5-year study period.
• The "start-up effect" was consistently evident across all examined socioeconomic subgroupings.
• The observed reduction in utilization was consistent across different employers and member cohorts.

Conclusions:

• Increasing duration of membership in prepaid group practices is associated with decreased utilization rates.
• The "start-up effect" is a significant phenomenon impacting healthcare utilization within PGPs.
• Findings have critical implications for national health policy, HMO administration, and PGP operational management.