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

Egyptian Journal of Forensic Sciences

Table 5 Multivariate Linear regression analysis for Foti model 3 (lower jaw) affecting chronological age in group I (n = 1000)

	B	SE	95% CI (LL-UL)	t	p
(Constant)	3.353	2.224	-1.013 – 7.718	1.507	0.132
Number of lower premolars	0.313	0.077	0.161 – 0.464	4.055	< 0.001^*
Number of permanent lower second molars	0.321	0.077	0.170 – 0.472	4.180	< 0.001^*
Number of lower third molars	–	–	–	–	–
Number of erupted third molars	–	–	–	–	–
Number of deciduous lower incisors	0.102	0.122	-0.137 – 0.341	0.838	0.402
Number of permanent lower canines	0.900	1.042	-1.145 – 2.945	0.863	0.388
Number of permanent lower incisors	0.736	0.121	0.498 – 0.974	6.058	< 0.001^*
Number of deciduous lower canines	0.489	1.041	-1.555 – 2.532	0.469	0.639
Number of deciduous lower molars	0.038	0.073	-0.106 – 0.182	0.520	0.603
Number of permanent lower first molars	0.759	0.107	0.549 – 0.968	7.098	< 0.001^*
R² = 0.649, F = 228.741, 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 III equation: 3.353 + (0.313* Number of lower premolars) + (0.321* Number of permanent lower 2nd molars) + (0.102* Number of deciduous lower incisors) + (0.900* Number of permanent lower canines) + (0.736* Number of permanent lower incisors) + (0.489* Number of deciduous lower canines) + (0.038* Number of deciduous lower molars) + (0.759* Number of permanent lower 1st molars)