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Contingency table of subjects with and without fluorosis as determined by Δ Q (QLF) and photographic TF score
| Condition | Manchester (869) | Newcastle (905) | χ2chi square | |
|---|---|---|---|---|
|
Fluorosis ΔQch |
No Fluorosis |
783 (90%) |
731 (81%) |
χ2 (1)= 31.735, P<0.0001 |
| Fluorosis |
86 (10%) |
172 (19%) |
||
| Fluorosis photo | Fluorosis TF 0-2 |
863 (99%) |
843 (93%) |
χ2 (1)= 45.640, P<0.0001 |
| Fluorosis TF 3-5 | 6 (1%) | 62 (7%) |
