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Table 2 Population distribution according to the number of missing teeth in the tooth extraction cohorta

From: The effect of missing teeth on dementia in older people: a nationwide population-based cohort study in South Korea

  The number of missing teeth p-value
1–6 7–12 ≥13
(people) (%) (people) (%) (people) (%)  
Total 84,411   17,341   3151   
 Male 27,112 32.1 6613 38.1 1386 44.0 <.001b
 Female 57,299 67.9 10,728 61.9 1765 56.0  
Age
 60–69 61,829 73.2 12,459 71.8 2282 72.4 <.001b
 70–79 20,398 24.2 4492 25.9 809 25.7  
  ≥ 80 2184 2.6 390 2.2 60 1.9  
Residential area
 Urban 48,167 57.1 9589 55.3 1731 54.9 <.001b
 Rural 36,244 42.9 7752 44.7 1420 45.1  
Eligibility
 Head of household 35,076 41.6 7426 42.8 1399 44.4 <.001b
 Family member 44,844 53.1 9165 52.9 1638 52.0  
 Medical aid beneficiaries 4491 5.3 750 4.3 114 3.6  
Income level
 First quintile 17,073 20.2 3386 19.5 629 20.0 <.001b
 Second quintile 10,074 11.9 2201 12.7 406 12.9  
 Third quintile 11,513 13.6 2561 14.8 502 15.9  
 Fourth quintile 18,139 21.5 3729 21.5 638 20.2  
 Fifth quintile 27,612 32.7 5464 31.5 976 31.0  
Experience of dental caries
 No 41,170 48.8 7898 45.5 1405 44.6 <.001b
 Yes 43,241 51.2 9443 54.5 1746 55.4  
Experience of periodontal treatment
 No 35,306 41.8 5964 34.4 1012 32.1 <.001b
 Yes 49,105 58.2 11,377 65.6 2139 67.9  
Onset of dementia
 No 74,230 87.9 15,083 87.0 2738 86.9 <.001b
 Yes 10,181 12.1 2258 13.0 413 13.1  
  1. aIt is helpful to refer to Table 1 to see statistical differences from the sample population shown in this table
  2. bStatistically significant at a 95% confidence interval