Progress in Orthodontics

Table 9 Comparison of our African in-out values with those measured by Andrews

From: Three-dimensional assessment of teeth first-, second- and third-order position in Caucasian and African subjects with ideal occlusion

Africans—in-out				Andrews—in out			Comparison
	n	Mean	Standard deviation	n	Mean	Standard deviation	t test	p level
U1	58	1.62	.30	240	2.01	.32	−8.73	<0.001
U2	58	1.25	.24	240	1.84	.30	−15.82	<0.001
U3	58	1.65	.31	240	2.67	.39	−21.40	<0.001
U4	58	1.89	.33	240	2.54	.35	−13.36	<0.001
U5	58	1.85	.29	240	2.48	.36	−14.22	<0.001
U6	58	2.29	.40	240	2.88	.40	−10.17	<0.001
U7	58	2.47	.56	238	3.00	.51	−6.58	<0.001
L1	58	1.18	.21	240	1.59	.27	−12.61	<0.001
L2	58	1.16	.19	240	1.64	.32	−14.63	<0.001
L3	58	1.36	.28	240	2.37	.40	−22.57	<0.001
L4	58	2.01	.38	240	2.72	.43	−12.52	<0.001
L5	56	2.06	.45	240	2.60	.34	−8.49	<0.001
L6	58	2.53	.37	240	3.02	.40	−9.00	<0.001
L7	58	2.22	.65	236	2.79	.47	−6.22	<0.001

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