Fig. 3From: National dental policies and socio-demographic factors affecting changes in the incidence of periodontal treatments in Korean: A nationwide population-based retrospective cohort study from 2002–2013Insurance status-specific 1-year incidence rates of periodontal treatment (a); and sex-specific accumulated incidence rates of periodontal treatment (b) during 2002–2013 in South Korea. NHIS, National Health Insurance Service; MAP, Medical Aid ProgramBack to article page