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Table 7 Linear regression analysis grouped by sex. Model 1: Demirjian method in girls, Model 2: Demirjian method in boys, Model 3: Willems method in girls, Model 4: Willems method in boys, Model 5: Nolla method in girls and Model 6: Nolla method in boys. * p < 0.001

From: Accuracy assessment of dental age estimation with the Willems, Demirjian and Nolla methods in Spanish children: Comparative cross-sectional study

Model β SE β t p β (95% CI) F R2 R2 adjusted Formula to predict CA
(1) Constant 1.01 0.23 4.33 0.000 0.55 1.47 1133.66* 0.7907 0.7900 CA = 1.01 + 0.81 x DA Demirjian girls
Predictor 0.81 0.02 33.67 0.000 0.77 0.86
(2) Constant 0.74 0.24 3.09 0.002 0.27 1.22 1191.13* 0.7988 0.7981 CA = 0.74 + 0.85 x DA Demirjian boys
Predictor 0.85 0.02 34.51 0.000 0.80 0.90
(3) Constant 1.01 0.23 4.43 0.000 0.56 1.47 1183.02* 0.7977 0.7970 CA = 1.01 + 0.87 x DA Willems girls
Predictor 0.87 0.03 34.40 0.000 0.82 0.92
(4) Constant 0.76 0.24 3.19 0.002 0.29 1.24 1194.54* 0.7993 0.7986 CA = 0.76 + 0.88 x DA Willems boys
Predictor 0 0.88 0.03 34.56 0.000 0.83 0.93
(5) Constant 1.65 0.25 6.60 0.000 1.16 2.14 844.76* 0.7379 0.7371 CA = 1.65 + 0.90 x DA Nolla girls
Predictor 0.90 0 0.03 29.06 0.000 0.84 0.96
(6) Constant 0.59 0.25 2.31 0.022 0.09 1.09 1099.80* 0.7857 0.7850 CA = 0.59 + 0.98 x DA Nolla boys
Predictor 0.98 0.03 33.16 0.000 0.92 1.04