Table 1. The mean age of all participants (n = 537), girls (n = 273), and boys (n = 264) calculated by different methods .

Method		Mean age (years)	Mean estimated age - mean chronological age (years)	Standard deviation	Minimum age (years)	Maximum age (years)
Chronological age	All	8.93	-	2.04	3.90	14.50
	Boys	8.95	-	2.07
	Girls	8.90	-	2.01
Demirjian’s method	All	9.80	0.87	2.29	5.90	17.00
	Boys	9.86	0.90	2.31
	Girls	9.75	0.85	2.15
Willem’s method	All	9.30	0.36	2.05	4.50	16.03
	Boys	9.38	0.43	2.10
	Girls	9.21	0.31	2.06
Cameriere’s method	All	8.74	-0.18	1.95	4.05	16.90
	Boys	8.68	-0.27	1.87
	Girls	8.79	-0.11	1.91
Smith’s method	All	8.99	0.06	2.05	4.31	15.60
	Boys	9.07	0.12	2.01
	Girls	8.91	0.00	2.05
Values are mean ± SD.					* Difference was not significant.