Ethnic group		Gender	Number of subjects	Mean	Std. Deviation	P-value
Arab	IICD	male	33	32.5	2.95	0.09
	IICD	female	59	33.54	2.79	0.09
	OICD	male	33	92.38	6.17	0.17
	OICD	female	59	94.04	4.21	0.17
Black	IICD	male	22	33.81	2.48	0.64
	IICD	female	40	34.13	2.62	0.64
	OICD	male	22	94.83	5.8	0.14
	OICD	female	40	93.71	4.49	0.14
Hamites	IICD	male	67	30.25	2.3	0.38
	IICD	female	59	29.89	2.24	0.38
	OICD	male	67	96.52	5.14	0.001
	OICD	female	59	94.02	4.24	0.001