Table 1. Descriptive behavioural data.

	NS Group (20)		CPI Group (21)		Two-sample T Test
	Mean	SD	Mean	SD	t value	p
Age (years)	38.65	7.40	40.62	7.52	−0.85	0.40
Education (years)	15.55	3.61	12.76	3.60	2.48	0.02
SAS	37.40	8.12	41.33	6.32	−1.73	0.09
PSQI	2.85	0.99	13.33	3.02	15.07	< 0.001

	NS Group (20)		CPI Group (21)		Chi-Square Test
Gender(F/M)	F	M	F	M	Pearson Chi-Square	P
	14(70%)	6(30%)	16(76%)	5(24%)	0.2	0.655

F indicates female; M indicates male.