TABLE 1.

Demographic characteristics of primary insomnia (PI) patients and healthy controls (HC) in the present study.

	PI (N = 33)	HC (N = 38)	P value
Male/female	10/23	15/23	0.651
Age (years)	42.27 ± 9.27	43.72 ± 10.10	0.768
SRSS	34.94 ± 6.92	16.33 ± 2.25	< 0.001
PSQI	13.54 ± 3.54	3.86 ± 2.21	< 0.001
SAS	53.75 ± 10.09	24.31 ± 3.49	< 0.001
SDS	47.04 ± 9.60	16.00 ± 9.77	< 0.001
ISI	17.63 ± 6.30	−	−

Chi-squared test was used for gender comparisons; two-tailed two-sample t-tests were used for SRSS, PSQI, SAS, SDS and age comparisons. The significance level was set as p < 0.05. Values are expressed as the means ± standard deviations. SRSS, Self-Rating Scale of Sleep; PSQI, Pittsburgh Sleep Quality Index; SAS, Self-Rating Anxiety; SDS, Self-Rating Depression Scale; ISI: Insomnia Severity Index.