TABLE 1. Means (in months) and standard deviation (SD) of chronological age and estimated dental age using the methods proposed by Nolla and Nicodemo, et al. for Brazilian boys and girls.

Groups	Age ranges (months)	Chronological Age		Boys Nicodemo, et al.		Nolla		Chronological Age		Girls Nicodemo, et al.		Nolla
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
1	82-87	85.30	2.01	82.80	8.49	86.40	8.00	83.80	1.99	93.60	15.80	87.60	17.02
2	88-93	90.60	1.71	86.40	9.47	92.40	5.80	91.20	1.66	88.40	6.05	84.00	7.59
3	94-99	96.40	1.69	91.60	6.05	96.00	7.59	96.20	2.22	101.30	10.58	92.00	13.42
4	100-105	102.00	1.70	94.80	8.89	94.80	3.79	102.30	1.82	96.00	5.12	90.00	6.27
5	106-111	108.70	1.64	100.80	14.09	103.20	6.20	108.80	1.77	101.50	11.61	99.70	9.01
6	112-117	114.00	1.99	98.70	10.00	99.60	8.49	114.20	1.48	113.30	16.00	108.00	14.70
7	118-123	120.50	1.69	116.70	14.29	112.40	11.09	120.50	1.83	117.00	9.05	107.00	8.02
8	124-129	126.80	1.66	128.70	31.79	113.50	12.43	125.60	1.69	127.60	8.09	116.70	5.61
9	130-135	131.90	1.10	122.40	11.03	118.80	13.21	132.60	1.69	124.40	9.71	117.80	10.49
10	136-141	139.10	1.83	131.10	8.76	129.40	11.70	138.80	2.23	135.30	12.11	125.50	12.43
11	142-147	144.80	1.54	137.50	11.61	132.90	18.63	144.40	1.78	136.80	14.09	129.60	12.39
12	148-153	150.60	1.43	133.20	19.14	132.00	24.00	150.70	1.42	146.40	9.47	136.80	8.39
13	154-159	156.50	1.75	138.50	27.55	145.10	25.43	156.00	1.49	153.60	17.71	139.20	15.18
14	160-165	162.20	1.87	153.60	13.62	150.00	12.96	162.40	2.40	160.00	21.63	148.00	19.90
15	166-171	169.00	1.83	160.00	6.00	156.00	14.70	168.40	1.91	160.00	14.84	152.00	19.74
16	172-177	174.30	1.68	151.60	9.71	149.50	9.84	174.70	2.10	161.50	18.87	146.20	12.94
17	178-183	179.30	1.64	162.00	6.31	163.20	18.93	180.30	2.00	162.00	12.96	153.60	13.62
18	184-189	186.30	0.95	174.00	14.14	170.40	19.43	186.40	1.51	173.30	23.32	162.70	20.00
	Total	135.9	30.40	125.87	29.51	125.30	28.63	135.97	30.83	130.71	29.95	122.15	27.87