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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