Table 3.
Summary of mean differences between dental age (DA) and chronological age (CA) from Cameriere's European formula and the South Chinese formula based on ridge regression for males and females in the test dataset 1 (144 OPGs).
| Gender | Number | CA (±SD) | DA (±SD) | ME (±SD) | 95%CI | MAE (±SD) | RMSE | P-value |
|---|---|---|---|---|---|---|---|---|
| Males | 72 | 9.97 (±3.40) | 9.50 (±2.89) | −0.47 (±1.11) | −0.73 to −0.21 | 1.00 (±0.65) | 1.17 | 0.00* |
| 9.95 (±3.48) | −0.02 (±0.71) | −0.19 to 0.15 | 0.52 (±0.48) | 0.69 | 0.82 | |||
| Females | 72 | 10.00 (±3.40) | 9.32 (±2.65) | −0.69 (±1.19) | −0.97 to −0.41 | 1.19 (±0.67) | 1.37 | 0.00* |
| 9.87 (±3.17) | −0.14 (±0.73) | −0.31 to 0.04 | 0.58 (±0.45) | 0.74 | 0.12 | |||
| Total | 144 | 9.99 (±3.39) | 9.41 (±2.76) | −0.58 (±1.15) | −0.77 to −0.39 | 1.10 (±0.66) | 1.28 | 0.00* |
| 9.91 (±3.31) | −0.08 (±0.72) | −0.20 to 0.04 | 0.55 (±0.47) | 0.72 | 0.20 |
ME: mean error; SD: standard deviation; CI: confidence interval; MAE: mean absolute error; RMSE: root mean square error.
P-value: obtained using paired samples t test or Wilcoxon's signed rank test.
*
Values that showed significant difference.