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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