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Table 2 Crude and standardized annual numbers (%) of examined 5-year old children in New Zealand who had no obvious decay experience (caries-free) together with mean dmft

From: Water fluoridation and ethnic inequities in dental caries profiles of New Zealand children aged 5 and 12–13 years: analysis of national cross-sectional registry databases for the decade 2004–2013

  Crude Standardizeda
Year No. exam No. caries-free (%) Mean dmft Popn No. caries-free (%) Mean dmft
2004 37,815 19,693 (52.1) 2.11 56,790 29,025 (51.1) 2.18
2005 39,173 20,352 (52.0) 2.24 58,750 30,139 (51.3) 2.28
2006 39,433 20,869 (52.9) 2.15 58,040 30,227 (52.1) 2.22
2007 33,783 17,355 (51.4) 2.27 56,240 28,726 (51.1) 2.27
2008 39,240 22,381 (57.0) 1.98 56,710 31,963 (56.4) 2.03
2009 43,625 24,259 (55.6) 1.97 58,280 32,102 (55.1) 2.01
2010 44,752 25,581 (57.2) 1.90 58,080 32,806 (56.5) 1.94
2011 44,653 26,614 (59.6) 1.82 59,290 34,786 (58.7) 1.88
2012 46,668 27,475 (58.9) 1.84 61,790 35,620 (57.6) 1.93
2013 48,176 27,847 (57.8) 1.86 63,820 36,175 (56.7) 1.93
  1. aUp-scaled to national figures based on (i) Statistic New Zealand’s annual population estimates of children by ethnicity, (ii) fluoridation exposure estimates, modelled using a quadratic regression model from the observed annual data over the study period by ethnicity, and (iii) assuming unobserved children’s measurements can be estimated by the observed values for each ethnicity/fluoridation/year combination