Reliability of mathematical regression models for age estimation in the mixed dentition stage for Egyptian children

Egyptian Journal of Forensic Sciences

Table 3 Multivariate Linear regression analysis for Foti model 1 (upper & lower jaws) affecting chronological age in group I (n = 1000)

	B	SE	95% CI (LL-UL)	T	P
(Constant)	1.607	1.831	-1.985 – 5.199	0.878	0.380
Number of deciduous upper incisors	0.247	0.051	0.148 – 0.347	4.872	< 0.001^*
Number of deciduous upper molars	-0.127	0.135	-0.393 – 0.139	-0.939	0.348
Number of permanent upper canines	–	–	–	–	–
Number of permanent upper first molars	0.000	0.062	-0.123 – 0.122	-0.008	0.994
Number of permanent upper second molars	0.231	0.075	0.084 – 0.378	3.082	0.002^*
Number of upper third molars	–	–	–	–	–
Number of lower premolars	0.084	0.067	-0.048 – 0.215	1.251	0.211
Number of permanent lower second molars	0.194	0.075	0.048 – 0.341	2.600	0.009^*
Number of lower third molars	–	–	–	–	–
Number of erupted third molars	–	–	–	–	–
Number of deciduous lower incisors	0.180	0.099	-0.015 – 0.375	1.816	0.070
Number of permanent lower canines	1.525	0.847	-0.138 – 3.188	1.799	0.072
Number of permanent upper incisors	0.793	0.047	0.700 – 0.886	16.746	< 0.001^*
Number of permanent upper premolars	0.062	0.137	-0.207 – 0.330	0.451	0.652
Number of deciduous upper canines	0.114	0.062	-0.008 – 0.236	1.831	0.067
Number of permanent lower incisors	0.382	0.100	0.186 – 0.578	3.824	< 0.001^*
Number of deciduous lower canines	1.360	0.847	-0.303 – 3.022	1.605	0.109
Number of deciduous lower molars	-0.044	0.059	-0.160 – 0.072	-0.740	0.460
Number of permanent lower first molars	0.424	0.088	0.251 – 0.596	4.822	< 0.001^*
R² = 0.775, F = 226.401, p < 0.001^*

poor agreement < 0.50 moderate agreement 0.50—< 0.75
good agreement 0.75—0.90 excellent agreement > 0.90
SE Standard Error, C.I Confidence interval, LL Lower limit, UL Upper Limit, B Unstandardized Coefficients, F, p f and p values for the model, R² Coefficient of determination, t t-test of significance
^*Statistically significant at p ≤ 0.05
EGY I equation: 1.607 + (0.247* Number of deciduous upper incisors) + (-0.127* Number of deciduous upper molars) + (0.0* Number of permanent upper 1st molars) + (0.231* Number of permanent upper 2nd molars) + (0.084* Number of lower premolars) + (0.194* Number of permanent lower 2nd molars) + (0.180* Number of deciduous lower incisors) + (1.525* Number of permanent lower canines) + (0.793* Number of permanent upper incisors) + (0.062* Number of permanent upper premolars) + (0.114* Number of deciduous upper canines) + (0.382* Number of permanent lower incisors) + (1.360* Number of deciduous lower canines) + (-0.044* Number of deciduous lower molars) + (0.424* Number of permanent lower 1st molars)