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Table 1 Baseline characteristics of the study cohort

From: 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 2002–2013

 

Males

Females

Total

n

%

n

%

Total

513258

50.1 %

512082

49.9 %

1025340

Age group (years)

  ≤ 9

71921

14.0 %

64661

12.6 %

136582

 10–19

74447

14.5 %

67495

13.2 %

141942

 20–29

86355

16.8 %

84492

16.5 %

170847

 30–39

95929

18.7 %

91788

17.9 %

187717

 40–49

85646

16.7 %

82681

16.1 %

168327

 50–59

48254

9.4 %

48862

9.5 %

97116

 60–69

34353

6.7 %

41169

8.0 %

75522

  ≥ 70

16353

3.2 %

30934

6.0 %

47287

Household incomea

 First quintile

70088

13.7 %

84513

16.5 %

154601

 Second quintile

79071

15.4 %

78685

15.4 %

157756

 Third quintile

103744

20.2 %

97450

19.0 %

201194

 Fourth quintile

123727

24.1 %

118422

23.1 %

242149

 Fifth quintile

136628

26.6 %

133012

26.0 %

269640

Insurance status

 MAP

13049

3.2 %

17664

3.4 %

30713

 NHIS, employees

248048

48.3 %

248549

48.5 %

496597

 NHIS, self-employed

252161

49.1 %

245869

48.0 %

498030

Health statusb

 Healthy

494934

96.4 %

503096

98.2 %

998030

 Major disability

5828

1.1 %

3633

0.7 %

9461

 Minor disability

12496

2.4 %

5353

1.0 %

17849

Living areac

 Urban

460837

89.8 %

459751

89.8 %

920588

 Rural

52421

10.2 %

52331

10.2 %

104752

  1. NHIS National health insurance service, MAP Medical aid program
  2. aTotal of 41 groups classified into quintiles (with MAP beneficiaries in the first quintile)
  3. bClassification based on the Handicapped Welfare Law in South Korea
  4. cClassification based on rural (<50,000 residents) or urban (≥50,000 residents) living