Table 10 Logistic regression models for caries and fluorosis

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%