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Table 9 Chi-squared tests and Prevalence Risk Ratios for caries and fluorosis

From: The association between social deprivation and the prevalence and severity of dental caries and fluorosis in populations with and without water fluoridation

 

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%)

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