Table 5.

Estimation of chronological age using step-wise regression analysis for South African Black and Indian population groups of KZN in individuals aged between 5.00 and 19.99 years (including third molars).

Maxillary					Mandibular
Coefficients	Estimates	Standard Error	t-Value	p-Value	Coefficients	Estimates	Standard Error	t-Value	p-Value
South African Black Females (KZN)
Age = 9.45 − 3.79(X3) − 1.76(X7) + 1.06(N0)					Age = 9.77 − 1.49(s) + 1.03(N0) − 0.27(X8) + 8.12(X1)
Intercept	9.45	0.46	20.65	<0.001	Intercept	9.77	0.61	15.97	<0.001
Max X3	−3.79	1.79	−2.12	0.036	S	−1.49	0.29	−5.08	<0.001
Max X7	−1.76	0.63	−2.77	0.006	N0	1.03	0.10	10.32	<0.001
N0	1.06	0.08	13.19	<0.001	Man X8	−0.27	0.17	−1.59	0.115
					Man X1	8.12	2.80	2.90	0.004
South African Black Males (KZN)
Age = 10.47 − 6.92(X3) − 0.99(X7) + 0.97(N0) − 0.36(X8)					Age = 11.10 − 1.98(s) + 0.87(N0) − 0.80(X8) + 7.80(X6)
Intercept	10.47	0.43	24.40	<0.001	Intercept	11.10	0.54	20.58	<0.001
Max X3	−6.92	1.56	−4.42	<0.001	S	−1.98	0.29	−6.85	<0.001
Max X7	−0.99	0.47	−2.13	0.034	N0	0.87	0.09	10.12	<0.001
N0	0.97	0.07	13.06	<0.001	Man X8	−0.80	0.22	−3.58	<0.001
Max X8	−0.36	0.14	−2.49	0.014	Man X6	7.80	2.26	3.46	<0.001
South African Indian Female (KZN)
Age = 13.46 + 11.70(X1) + 3.31(X2) − 9.72(X3) − 7.92(X5) − 8.19(X6) − 1.35(X7) + 0.45(N0) − 0.88 (X8)					Age = 13.15 − 2.76(s) + 0.54(N0) − 1.59(X8) + 7.92(X2) − 6.72(X3) + 12.40(X6)
Intercept	13.46	0.57	23.59	<0.001	Intercept	13.15	0.54	24.29	<0.001
Max X1	11.70	5.45	2.15	0.033	S	−2.76	0.63	−4.36	<0.001
Max X2	3.31	2.13	1.56	0.121	N0	0.54	0.08	6.35	<0.001
Max X3	−69.72	3.59	−2.71	0.008	Man X8	−1.59	0.31	−5.06	<0.001
Max X5	−7.92	2.02	−3.92	<0.001	Man X2	7.92	4.40	1.80	0.074
Max X6	−8.19	5.04	−1.63	0.106	Man X3	−6.72	4.55	−1.48	0.141
Max X7	−1.35	0.59	−2.30	0.023	Man X6	12.40	5.59	2.22	0.028
N0	0.45	0.09	4.93	<0.001
Max X8	−0.88	0.19	−4.72	<0.001
South African Indian Male (KZN)
Age = 10.17 + 5.50(X2) − 2.30(X3) − 2.71(X4) − 2.86(X6) − 1.86(X7) + 0.97(N0) − 0.39(X8)					Age = 9.44 − 1.31(s) + 1.09(N0) − 0.46(X8) + 8.89(X1)
Intercept	10.17	0.43	23.50	<0.001	Intercept	9.44	0.44	21.66	<0.001
Max X2	5.50	2.26	2.44	0.016	S	−1.31	0.25	−5.17	<0.001
Max X3	−2.30	1.52	−1.51	0.132	N0	1.09	0.07	15.68	<0.001
Max X4	−2.71	1.46	−1.85	0.066	Man X8	−0.46	0.22	−2.09	0.038
Max X6	−2.86	1.29	−2.22	0.028	Man X1	8.89	3.79	2.35	0.020
Max X7	−1.86	0.46	−4.01	<0.001
N0	0.97	0.07	14.08	<0.001
Max X8	−0.39	0.14	−2.74	<0.001