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Table 5 Characteristics of study population at baseline

From: The differences in healthcare utilization for dental caries based on the implementation of water fluoridation in South Korea

Variables N/Mean %/SD
Regional variables
Water fluoridation
 Yes (n = 13) 49,122 10.40
 No (n = 151) 423,128 89.60
Period from implementation of water fluoridation 0.68 2.51
Number of dentists per 1,000 residents 0.28 0.12
Financial independence rate of local government 50.63 24.45
Individual variables
Sex
 Male 239,445 50.70
 Female 232,805 49.30
Age (Years)
 -19 142,793 30.24
 20–29 66,863 14.16
 30–39 80,042 16.95
 40–49 72,654 15.38
 50–59 42,027 8.90
 60–69 38,745 8.20
  > 70 29,126 6.17
Income (percentile)
 -10 % (low) 49,834 10.55
 11–20 % 30,220 6.40
 21–30 % 34,226 7.25
 31–40 % 40,371 8.55
 41–50 % 45,727 9.68
 51–60 % 48,872 10.35
 61–70 % 54,782 11.60
 71–80 % 58,121 12.31
 81–90 % 58,827 12.46
  + 91 % (high) 51,270 10.86
Types of insurance coverage
 Medical Aid 18,607 3.94
 NHI, self-employed insured 213,931 45.30
 NHI, employee insured 239,712 50.76
Year of baseline
 2003 412,110 87.27
 2004 11,234 2.38
 2005 6,440 1.36
 2006 6,703 1.42
 2007 5,847 1.24
 2008 5,576 1.18
 2009 5,156 1.09
 2010 4,838 1.02
 2011 4,567 0.97
 2012 4,918 1.04
 2013 4,861 1.03
Dentofacial anomalies
 Yes 83 0.02
 No 472,167 99.98
Disorders of toothe development and eruption
 Yes 881 0.19
 No 471,369 99.81
 Follow up time (year) 9.12 2.80
Total 472,250 100.00