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Table 4 Crude and standardized annual numbers (%) of examined year 8 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 49,456 22,573 (45.6) 1.57 64,025 28,801 (45.0) 1.60
2005 48,711 21,569 (44.3) 1.67 63,050 27,637 (43.8) 1.70
2006 48,738 22,276 (45.7) 1.57 62,385 28,216 (45.2) 1.60
2007 46,592 21,737 (46.7) 1.53 61,715 28,692 (46.5) 1.54
2008 47,037 23,997 (51.0) 1.42 61,355 31,105 (50.7) 1.44
2009 46,220 24,079 (52.1) 1.36 60,610 31,255 (51.6) 1.39
2010 46,740 24,890 (53.3) 1.23 60,460 31,771 (52.5) 1.26
2011 44,659 23,993 (53.7) 1.24 60,210 31,972 (53.1) 1.27
2012 47,121 26,370 (56.0) 1.16 60,650 33,445 (55.1) 1.20
2013 46,059 25,060 (54.4) 1.12 61,025 32,923 (53.9) 1.15
  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