Table 1. General characteristics of the study subjects over the 6-year analysis period (July 2010 through November 2015).
| Characteristics | No. of outpatients (%) | |
|---|---|---|
| Diagnosisa) | ||
| Gingivitis | 8,046,685 (17.6) | |
| Advanced periodontitis | 37,602,621 (82.4) | |
| Sex | ||
| Male | 21,530,000 (47.1) | |
| Female | 24,120,000 (52.9) | |
| Age group (yr) | ||
| 35–44 | 12,430,000 (27.2) | |
| 45–54 | 18,010,000 (39.5) | |
| 55–64 | 15,210,000 (33.3) | |
| Residence area | ||
| Metropolisb) | 34,010,000 (75.5) | |
| Small and medium-sized cityc) | 11,640,000 (25.5) | |
a)Patients with a primary diagnosis of periodontitis (K05) who received scaling; b)Classified as metropolises: Seoul, Gyeonggi, Incheon, Daejeon, Daegu, Gwangju, Busan, and Ulsan; c)Classified as small and medium-sized cities: Gangwon, Gyeongnam, Gyeongbuk, Jeonnam, Jeonbuk, Chungnam, Chungbuk, and Jeju.