Table 5 Characteristics of study population at baseline
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 |