# Table 10 Logistic regression models for caries and fluorosis

95% CI for Odds ratio
B (SE) Sig Lower Odds ratio Upper
Caries into dentine
Included
Constant −5.041 (1.151)
City 0.610 (0.104) P < 0.001 1.500 1.840 2.258
Age at Exam 0.298 (0.093) P = 0.001 1.123 1.347 1.616
IMD quintile 2 ns ns - - -
IMD quintile 3 0.496 (0.169) P = 0.003 1.179 1.642 2.288
IMD quintile 4 0.878 (0.168) P < 0.001 1.730 2.406 3.345
IMD quintile 5 1.117 (0.166) P < 0.001 2.05 3.056 4.234
R2 =0.088 (Nagelkerke) Model χ2 (6) = 119.3, p < 0.0001 Hosmer & Lemeshow chi square = 4.804 sig = .778 PPV = 56.8%; NPV = 65.7%
Caries white spot lesion
Included
Constant −4.511 (1.325)
City 0.747 (0.122) p < 0.001 1.622 2.11 2.680
Age at Exam 0.357 (0.107) p = 0.001 1.160 1.430 1.762
IMD quintile 2 0.473 (0.158) P = 0.003 1.179 1.607 2.190
IMD quintile 3 0.783 (0.166) p < 0.001 1.580 2.188 3.028
IMD quintile 4 1.423 (0.193) p < 0.001 2.847 4.152 6.055
IMD quintile 5 1.487(0.187) p < 0.001 3.065 4.424 6.387
R2 =0.13 (Nagelkerke) Model χ2 (6) = 165.47, p < 0.0001 Hosmer & Lemeshow chi square = 11.733 sig = .164 PPV = 75.3%; NPV = 57.0%
Fluorosis
Included
Constant −1.42 (0.132)
City 1.221 (0.103) P < 0.001 2.78 3.390 4.152
IMD quintile 1 0.411 (0.160) P = 0.01 1.101 1.508 2.065
IMD quintile 2 ns ns - - -
IMD quintile 3 ns ns - - -
IMD quintile 4 ns ns - - -
R2 = 0.11 (Nagelkerke). Model χ2 (7) = 154.95, p < 0.0001 Hosmer & Lemeshow chi square = 7.738 sig = .459 PPV = 56.4%; NPV = 69.5%
Fluorosis TF3+
Included
Constant −4.748 (0.468)
City 2.344 (0.432) P < 0.001 4.467 10.424 24.325
IMD quintile 1 ns ns - - -
IMD quintile 2 ns ns - - -
IMD quintile 3 ns ns - - -
IMD quintile 4 ns ns - - -
R2 = 0.11 (Nagelkerke). Model χ2 (5) = 57.094, p < 0.0001Hosmer & Lemeshow chi square = 2.936 sig = .938 PPV = 0%; NPV = 96.0%