	Nationality						T-test
	Non-Saudi			Saudi			T-test
	Mean	±	SD	Mean	±	SD	t	P-value
AOP	44.817	±	15.157	42.101	±	17.662	0.973	0.332
PCR	54.152	±	17.486	49.730	±	20.538	1.366	0.174
GBI	41.018	±	16.576	37.925	±	17.091	1.097	0.275
CAL	8.233	±	2.600	6.888	±	2.874	2.911	0.004*
%RBL	36.610	±	22.001	29.129	±	16.622	2.361	0.020*
PPD	4.817	±	1.935	4.225	±	1.428	2.147	0.033*