Table 2 Comparison between chronological age and dental age estimated by Willems method in males (n = 70).
From: Age estimation using dental and hand-wrist radiography among a sample of Egyptian children
Age group | Chronological age (years) | Estimated dental age (years) | Mean difference (years) | P value# | Mean absolute error (MAE) | ||
|---|---|---|---|---|---|---|---|
Mean ± SD | Median (years) | Mean ± SD | Median (years) | ||||
8 | 8.58 ± 0.29 | 8.60 | 8.29 ± 0.37 | 8.30 | − 0.29 ± 0.39 | 0.028* | 0.41 |
9 | 9.33 ± 0.26 | 9.30 | 9.86 ± 0.70 | 9.6 | + 0.53 ± 0.83 | 0.059 | 0.76 |
10 | 10.12 ± 0.05 | 10.1 | 9.66 ± 0.66 | 9.67 | − 0.46 ± 0.70 | 0.461 | 0.60 |
11 | 11.47 ± 0.26 | 11.5 | 11.60 ± 0.52 | 11.55 | + 0.13 ± 0.55 | 0.575 | 0.49 |
12 | 12.60 ± 0.39 | 12.8 | 12.42 ± 1.19 | 12.74 | − 0.18 ± 0.83 | 0.463 | 0.65 |
13 | 13.17 ± 0.19 | 13.15 | 13.58 ± 2.11 | 13.68 | + 0.41 ± 2.02 | 0.239 | 1.55 |
14 | 14.76 ± 0.15 | 14.8 | 13.64 ± 0.87 | 14.15 | − 1.12 ± 0.99 | 0.109 | 1.12 |
15 | 15.13 ± 0.05 | 15.1 | 13.51 ± 1.12 | 14.15 | − 1.62 ± 1.14 | 0.028* | 1.62 |
16 | 0 | 0 | 0 | 0 | 0 | 0 | − |
17 | 17.37 ± 0.39 | 17.2 | 16.02 ± 0.01 | 16.03 | − 1.35 ± 0.39 | 0.012* | 1.34 |
Total | 12.07 ± 2.89 | 11.95 | 11.87 ± 2.64 | 11.95 | − 0.20 ± 0.91 | 0.059 | 0.94 |
