Income-related Inequalities in Cancer Screening in Korea: Using Concentration Index (CI) and Decomposition of CI

Abstract

Cancer is one of the heaviest burdens of disease in Korea. For early detection and timely treatment, regular cancer screening is suggested for all individuals over aged 40. Although the rate of cancer screening is continuously increasing in Korea, existing literature suggest that income-related inequalities in cancer screening exist regardless of type of health care system. This study aimed to assess income-related inequalities in cancer screening using a nationally representative survey data. In addition, this study quantified socio-demographic factors contributing income-related inequalities in cancer screening in the Korean population. For our analysis, Korea National Health and Nutrition Examination Survey (KNHANES) 2010-2012 were used. To measure income-related inequalities, we employed concentration index (CI) and decomposition of the CI method. Our results showed that income-related inequalities in cancer screening exist indicating a pro-rich pattern along with a pro-rich pattern of horizontal inequity index (HI). The main contributors to the existing inequities were private insurance and income levels. Our study suggests that the identified inequities and main contributors in relation to cancer screening should be considered for policy interventions. Further longitudinal studies are needed to understand impact of changes in co-payment for cancer screening in Korea.