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Table 3 Results of the calculation of the dental age with the Willems method. The Wilcoxon test for paired data was applied by age groups and sex to compare the chronological age and dental age. Statistical tests were performed at a 95% confidence level (p ≤ 0.05). DA  Dental age, CA  Chronological age, Diff.SD Standard deviation differences, SD Standard deviation, Overestimation, Underestimation

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 Willems

p-value

CA-DA

Diff.SD

Trend

mean

SD

mean

SD

Girls

 4-6.9

59

6.46

0.48

7.00

0.89

0.000

-0.54

0.70

O

 7-7.9

65

7.50

0.30

7.77

0.79

0.008

-0.26

0.73

O

 8-8.9

69

8.45

0.28

8.37

0.60

0.145

0.08

0.59

U

 9-10.9

67

9.97

0.57

10.13

1.25

0.321

-0.16

1.05

O

 11-13.9

42

12.14

0.63

12.08

1.32

0.965

0.05

1.22

U

 Total

302

        

Boys

 4-6.9

63

6.40

0.55

6.88

1.24

0.000

-0.48

0.93

O

 7-7.9

54

7.60

0.28

8.26

1.09

0.000

-0.66

1.04

O

 8-8.9

67

8.45

0.29

8.81

0.76

0.000

-0.36

0.67

O

 9-10.9

63

9.89

0.58

10.11

1.16

0.163

-0.23

1.03

O

 11-13.9

55

12.15

0.60

12.16

0.88

0.782

-0.01

0.87

O

 Total

302