Table 3 Comparison between chronological age and dental age estimated by Willems method in females (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 | 8.42 ± 0.34 | 8.3 | 8.31 ± 0.20 | 8.15 | − 0.11 ± 0.50 | 0.269 | 0.40 |
9 | 9.48 ± 0.31 | 9.55 | 9.68 ± 0.63 | 10.03 | + 0.20 ± 0.37 | 0.248 | 0.35 |
10 | 10.15 ± 0.17 | 10.15 | 9.98 ± 0.55 | 9.64 | − 0.17 ± 0.38 | 0.093 | 0.62 |
11 | 11.36 ± 0.2 | 11.4 | 11.71 ± 1.79 | 12.6 | + 0.35 ± 1.69 | 0.406 | 1.42 |
12 | 12.12 ± 0.12 | 12.1 | 12.29 ± 2.43 | 11.83 | + 0.17 ± 2.50 | 1.000 | 2.02 |
13 | 13.22 ± 0.17 | 13.25 | 15.15 ± 0.01 | 15.79 | + 1.93 ± 0.17 | 0.168 | 2.56 |
14 | 14.36 ± 0.27 | 14.3 | 13.52 ± 1.82 | 12.89 | − 0.84 ± 1.85 | 0.099 | 1.85 |
15 | 15.33 ± 0.31 | 15.25 | 14.57 ± 1.34 | 14.81 | − 0.76 ± 1.12 | 0.123 | 0.98 |
16 | 16.28 ± 0.31 | 16.1 | 15.79 ± 0.00 | 15.79 | − 0.49 ± 0.37 | 0.027* | 0.49 |
17 | 17.00 ± 0.00 | 17 | 15.79 ± 0.00 | 15.79 | − 1.21 ± 0.00 | 0.157 | 1.21 |
Total | 12.42 ± 2.72 | 12.10 | 12.18 ± 2.88 | 11.76 | − 0.24 ± 1.33 | 0.239 | 0.96 |
