Table 1.

Demographic and clinical data.

Measure	IS (n = 30)	NIS (n = 62)	t	p-value
Age (years)	38.00 ± 11.85	37.47 ± 11.95	0.201	0.841*
Gender (male/female)	15/15	26/36	0.532	0.466#
Education level (years)	14.07 ± 3.34	15.42 ± 2.95	−1.889	0.065*
HAMD score	2.93 ± 1.46	0.19 ± 0.51	9.987	<0.001*
Adjusted HAMD score	1.23 ± 1.31	0.19 ± 0.51	4.214	<0.001*
HAMA score	3.20 ± 2.12	0.32 ± 0.79	7.187	<0.001*
Adjusted HAMA score	1.97 ± 2.00	0.32 ± 0.79	4.327	<0.001*
Insomnia score	1.70 ± 0.92	0.00 ± 0.00	10.172	<0.001*

Data are presented as mean ± SD.

^*indicates p values for two-sample two-tailed t-tests;

^#indicates p values for χ²-test. Adjusted HAMD score means HAMD scores after omission of sleep questions. Adjusted HAMA score means HAMA scores after omission of sleep questions. IS, healthy subjects with insomnia symptoms; NIS, healthy subjects without insomnia symptoms; SD, standard deviation; HAMD, Hamilton Depression Rating Scale; HAMA, Hamilton Anxiety Rating Scale.