Factors associated with the overuse or underuse of health care services among medical aid beneficiaries in Korea.

Purpose: To compare and contrast demographic characteristics and health care service utilization between overusers and underusers of health care services and to identify factors associated with the overuse or underuse of health care services among the medical aid beneficiaries in Korea.

Methods: Secondary data analysis was performed using health care costs and medical aid case management progress data. Data on demographic characteristics, health-related quality of life (HRQoL), and inappropriate health care service user category (overuse or underuse) were provided by the Medical-Aid Case Management Center of Korea, and heath care service reimbursement data were provided by the Korea National Health Insurance Corporation (NHIC).