. Author manuscript; available in PMC: 2020 May 1.

Published in final edited form as: Orthod Craniofac Res. 2019 Feb 8;22(2):99–104. doi: 10.1111/ocr.12288

Table 3.

The effects of ethnicity on the root to crown ratios

Teeth	African American		Hispanic		Caucasian		F test		P Values
	Mean	SD	Mean	SD	Mean	SD		FDR	AA vs H	AA vs C	H vs C
8,9	1.83	0.25	1.76	0.26	1.86	0.29	0.0051^*	0.0143	0.0215^*	0.3901	0.0017^*
7,10	2.01	0.28	2.00	0.30	2.17	0.39	<.0001^*	0.0005	0.7423	<.0001^*	<.0001^*
6,11	2.22	0.35	2.09	0.38	2.18	0.35	0.0321^*	0.056	0.0093^*	0.4459	0.1014
5,12	2.17	0.35	2.03	0.30	2.07	0.33	0.0175^*	0.0368	0.0053^*	0.0774	0.3212
4,13	2.17	0.38	2.14	0.39	2.13	0.39	0.7203	0.7757
3,14	2.00	0.35	2.08	0.33	1.95	0.26	0.0360^*	0.056	0.0586	0.4057	0.0149^*
2,15	2.11	0.31	2.13	0.37	2.06	0.28	0.3947	0.4605
24,25	1.88	0.29	1.79	0.33	1.98	0.34	0.0003^*	0.0011	0.0250^*	0.0303^*	<.0001^*
23,26	1.98	0.31	1.93	0.34	2.04	0.36	0.0442^*	0.0619	0.1887	0.1629	0.0127^*
22,27	2.17	0.38	2.15	0.38	2.26	0.45	0.0857	0.1091
21,28	2.37	0.38	2.20	0.40	2.48	0.43	<.0001^*	0.0005	0.0013^*	0.0226^*	<.0001^*
20,29	2.52	0.35	2.37	0.43	2.61	0.38	<.0001^*	0.0005	0.0058^*	0.0807	<.0001^*
19,30	2.20	0.30	2.18	0.24	2.21	0.32	0.8777	0.8777
18,31	2.09	0.29	2.02	0.33	2.17	0.31	0.0184	0.0368

P<0.05. SD: standard deviation; AA: African American; H: Hispanic; C: Caucasian; FDR: false discovery rate.