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Table 1 Study Sample Characteristics: N (%)

From: Did the extended coverage policy contribute to alleviating socioeconomic inequality in untreated dental caries of both children and adolescents in South Korea?

Variables Children aged 6–11 Adolescents aged 12–18
2007–09 2013–15 P-value 2007–09 2013–15 P-value
Total 2240 (100) 1449 (100)   2113 (100) 1466 (100)  
Gender
 Male 1167 (52.1) 758 (51.9) 0.937 1113 (53.7) 812 (52.1) 0.572
 Female 1073 (47.9) 691 (48.1)   1000 (46.3) 718 (47.9)  
Income level
 I (lowest) 553 (24.9) 347 (23.7) 0.671 524 (24.8) 348 (25.0) 0.872
 II 544 (23.9) 359 (26.7)   518 (24.8) 363 (25.1)  
 III 568 (25.3) 368 (25.2)   522 (24.8) 391 (25.7)  
 IV (highest) 575 (25.9) 375 (24.4)   549 (25.6) 364 (24.2)  
FTB
  < 2 308 (13.8) 117 (7.9) < 0.001 261 (12.3) 108 (7.7) < 0.001
  ≥ 2 1932 (86.2) 1332 (92.1)   1852 (87.7) 1358 (92.3)  
RDC
 No 755 (32.2) 427 (28.4) 0.116 1124 (53.4) 820 (57.3) 0.025
 Yes 1485 (67.8) 1022 (71.6)   989 (46.6) 646 (42.7)  
  1. P-values were obtained from complex samples crosstabs: Rao-Scott chi-squared test
  2. Values are presented by weighted prevalence % (95% CI)
  3. FTB (frequency of tooth brushing) and RDC (regular dental check-ups)