Fig. 2From: Assessment of trends in socioeconomic inequalities in cancer screening services in Korea, 1998–2012Concentration Index* for gastric cancer screening services with 95 % confidence interval, Korea National Health and Nutrition Examination Survey (KNHANES) cycle 1 (1998), cycle 3 (2005), and cycle 5 (2010–2012). *Concentration index presented in this figure are normalized concentration indices (Wagstff, 2005;2011)Back to article page