Table 2.

Comparison of chronological age and dental age calculated by Willems and Cameriere methods in different ANB skeletal classes.

Method	Sex	Class	N	Chronological age (CA)		Dental age (DA)		DA-CA		Paired-samples t-test
				Mean	SD	Mean	SD	Mean	SD	t(df)	p
Willems	Males	I	136	11.71	1.94	12.11	2.54	0.40	1.13	4.1 (135)	<0.001
		II	100	11.67	2.00	12.11	2.54	0.44	1.03	4.3 (99)	<0.001
		III	132	11.96	2.17	12.79	2.65	0.83	0.97	9.8 (131)	<0.001
		Total	368	11.79	2.04	12.36	2.65	0.57	1.06	10.2 (367)	<0.001
	Females	I	148	12.00	2.01	12.52	2.50	0.53	1.12	5.8 (147)	<0.001
		II	118	11.96	1.86	12.38	2.53	0.43	1.17	3.9 (117)	<0.001
		III	142	12.19	1.96	12.68	2.57	0.49	1.07	5.5 (141)	<0.001
		Total	408	12.05	1.95	12.54	2.53	0.48	1.12	8.8 (407)	<0.001
Cameriere	Males	I	136	11.71	1.94	11.44	2.04	−0.26	0.72	−4.36 (135)	<0.001
		II	100	11.67	2.00	11.44	1.90	−0.23	0.76	−3.06 (99)	0.003
		III	132	11.96	2.17	11.93	1.99	−0.02	0.73	−0.47 (131)	0.642
		Total	368	11.79	2.04	11.62	2.00	−0.19	0.80	−4.48 (367)	<0.001
	Females	I	148	12.00	2.01	11.86	1.70	−0.14	0.91	−1.88 (147)	0.063
		II	118	11.96	1.86	11.75	1.72	−0.20	0.73	−3.01 (117)	0.003
		III	142	12.19	1.96	11.94	1.74	−0.24	0.73	−4.02 (141)	<0.001
		Total	408	12.05	1.95	11.86	1.72	−0.17	0.74	−4.92 (407)	<0.001