Table 9

Chi-squared tests and Prevalence Risk Ratios for caries and fluorosis
Condition Manchester Newcastle χ2chi square Prevalence risk ratio
Clinical Caries: Threshold white spot lesion No obvious Caries 133 (15%) 228 (25%) P < 0.001 Prevalence Risk Ratio for Caries 0.88 in Newcastle
Obvious Caries 740 (85%) 682 (75%%)
Clinical Caries: Threshold caries in dentine No obvious Caries 473 (54%%) 614 (68%) P < 0.001 Prevalence Risk Ratio for Caries 0.70 in Newcastle
Obvious Caries 400 (46%) 296 (32%)
Photo Caries: Threshold white spot lesion No obvious Caries 177 (20%) 298 (33%) P < 0.001 Prevalence Risk Ratio for Caries 0.84 in Newcastle
Obvious Caries 696 (80%) 612 (67%)
Photo Caries: Threshold caries in dentine No obvious Caries 475 (54%) 626 (69%) P < 0.001 Prevalence Risk Ratio for Caries 0.67 in Newcastle
Obvious Caries 398 (46%) 284 (31%)
Fluorosis No fluorosis 638 (73%) 410 (45%) P < 0.001 Prevalence Risk Ratio for Fluorosis 2.06 times as high in Newcastle
Fluorosis TF 1-5 231 (27%) 496 (55%)
Fluorosis Fluorosis TF 0-2 863 (99%) 844 (93%) P < 0.001 Prevalence Risk Ratio for Fluorosis 7.00 times as high in Newcastle
Fluorosis TF 3-5 6 (1%) 62 (7%)

McGrady et al.

McGrady et al. BMC Public Health 2012 12:1122   doi:10.1186/1471-2458-12-1122

Open Data