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Table 3 The results of the group-wise correlation between the mean age and the mean CTR values

From: Does the crypt: tooth ratio in the developing tooth correlate with chronological age in children?—a novel, radiographic, cross-sectional pilot study using ImageJ tools

Group

n

Mean age (S.D)

Mean CTR (S.D)

Correlation coefficient ( r)

Sig.*

I

38

5.69 (0.79)

2.923 (0.61)

−0.713

0.000

II

38

8.62 (0.84)

1.940 (0.19)

−0.655

0.000

III

37

11.5 (0.81)

1.535 (0.16)

−0.588

0.000

IV

32

13.92 (0.61)

1.19 (0.18)

−0.718

0.000

Total

145

9.75 (3.14)

1.930 (0.73)

−0.898

0.000

  1. *Significant at p<0.05