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Table 3 Mean error and absolute mean error and root mean squared error and 95 % confidence intervals validating the Willems et al. (BC) method, overall and sex specific

From: Age estimation based on Willems method versus country specific model in Saudi Arabia children and adolescents

Sex N   Mean SD P
M + F 1146 Chronological Age 10.31 4.00 0.6653
Estimated age 10.28 3.51
Error 0.02 1.78
RMSE (95 %Cl) 1.7780 (1.711;1.845)
M 605 Chronological Age 10.50 4.04 0.5055
Estimated age 10.50 3.50
Error − 0.01 1.76
Absolute Error 1.34 1.13
RMSE (95 %Cl) 1.7582 (1.667;1.849)
F 541 Chronological Age 10.09 3.96 0.1560
Estimated age 10.03 3.51
Error 0.06 1.80
Absolute Error 1.33 1.22
RMSE (95 %Cl) 1.8003 (1.700;1.900)
  1. N: Number; M: total number of male subjects; F: total number of female subjects; Descriptive statistics for chronological age based on the method by Willems et al. [11] and for the (absolute) error between chronological age and estimated age: mean age and standard deviation (SD); RMSE: root mean squared error; 95 %CI: 95 % confidence intervals for RMSE; P: p-value from Wilcoxon signed rank test comparing age and age estimation based on Willems et al. (2001) [3]