| Condition | Manchester | Newcastle | χ2 chi 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%) |  |  |