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Table 5 Results of the calculation of the dental age with the Nolla method. The Wilcoxon test for paired data was applied by age groups and sex to compare the chronological age and dental age

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

Age groups n CA DA Nolla p-value CA-DA Diff.SD Trend
mean SD mean SD
Girls
 4-6.9 59 6.46 0.48 6.17 0.72 0.000 0.29 0.60 U
 7-7.9 65 7.50 0.30 6.85 0.81 0.000 0.66 0.76 U
 8-8.9 69 8.45 0.28 7.51 0.83 0.000 0.94 0.81 U
 9-10.9 67 9.97 0.57 8.97 1.00 0.000 1.00 0.96 U
 11-13.9 42 12.14 0.63 10.79 1.59 0.000 1.35 1.49 U
 Total 302         
Boys
 4-6.9 63 6.40 0.55 6.43 0.91 0.813 -0.03 0.69 O
 7-7.9 54 7.60 0.28 7.52 0.93 0.355 0.77 0.87 U
 8-8.9 67 8.45 0.29 7.99 0.69 0.000 0.47 0.60 U
 9-10.9 63 9.89 0.58 9.24 1.10 0.000 0.65 1.02 U
 11-13.9 55 12.15 0.60 11.05 0.97 0.000 1.10 1.00 U