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Table 4 Comparison between the actual and predicted age in the validation sample (N = 100)

From: The accuracy of age estimation from pulp chamber/crown volume ratio of canines obtained by cone beam computed tomography images: an Egyptian study

Age groups (years)

Actual age (years)

Predicted age (years)

Paired T test

Difference

(predicted − actual)

P value

1 (< 20)

Mean

17.20

19.85

2.60

< 0.001*

SD

1.4

1.6

1.3

2 (20–24)

Mean

22.00

25.00

3.03

< 0.001*

SD

1.3

1.5

0.77

3(25–29)

Mean

26.70

29.20

2.50

< 0.001*

SD

1.4

1.8

0.64

4 (30–34)

Mean

31.90

32.05

0.13

0.062

SD

1.4

1.5

0.28

5 (35–39)

Mean

36.90

37.14

0.24

0.056

SD

1.4

1.4

0.54

6 (40–44)

Mean

42.30

41.90

− 0.42

0.063

SD

1.6

2.2

1.1

7 (45–49)

Mean

47.50

45.89

− 1.59

< 0.001*

SD

1.5

1.4

0.47

8 (50–54)

Mean

52.20

48.72

− 3.45

< 0.001*

SD

1.6

1.7

1.1

9 (55–60)

Mean

57.10

52.30

− 4.75

< 0.001*

SD

1.9

1.9

0.55

  1. *Significant at p < 0.05