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Table 5 Contingency table of subjects with and without fluorosis as determined by Δ Q (QLF) and photographic TF score

From: Evaluating the use of fluorescent imaging for the quantification of dental fluorosis

  Condition Manchester (869) Newcastle (905) χ2 chi square
Fluorosis ΔQ ch 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%)