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Table 7 The table showing the descriptive statistics of the test sample, according to the age groups

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 Calendrical age (CA) (years) CTR Estimated age (EA) (years) EA-CA (years)
Mean SD Mean SD Mean SD Mean SD F df Sig*
I 16 5.54 0.84 3.23 0.25 4.74 0.95 –0.80 0.46 4.625 3 0.006
II 12 8.50 0.80 2.53 0.27 7.45 1.05 –1.05 0.44
III 13 11.64 1.03 1.74 0.33 10.50 1.28 –1.14 0.48
IV 11 14.17 0.54 1.16 0.18 12.73 0.68 –1.44 0.35
Total 52 9.57 3.41 2.26 0.84 8.50 3.25 –1.08 0.48
  1. SD standard deviation
  2. *Significant at p<0.05