Could investment in preventive health care services reduce health care costs among those insured with health insurance societies in Japan?

This study examined the impact of expenditures for preventive health care services on health care costs among those insured with health insurance societies in Japan using cross-sectional and longitudinal designs. The subjects of the study were those insured with Japan's 1481 health insurance societies belonging to the National Federation of Health Insurance Societies in 2003 and 2007. Multiple regression analyses were conducted using the forced entry method. Case rates, number of service days, and health care costs were used as dependent variables, and preventive health care expenditures, average age, number of the insured, gender ratio, average monthly salary, and dependents ratio were used as independent variables. Expenditures for preventive health care services showed significant negative correlations with both the number of service days and health care costs for inpatient and outpatient services in 2003 and 2007. The results showed that expenditures for preventive health care services had a negative relationship with health care costs. Thus, these findings support the effects of investment in preventive health activities as promoted by health insurance societies to reduce health care costs.