Table 1.

Descriptive statistics of measurement items.

Item abbreviation	Item content	Item mean (SD)	Expected influencea	Predictability
ISI1	Severity of sleep onset	0.58 (0.86)	1.027	0.748
ISI2	Sleep maintenance	0.52 (0.83)	1.212	0.771
ISI3	Early morning wakening problems	0.66 (0.92) 662.37	0.555	0.430
ISI4	Sleep dissatisfaction	1.37 (0.94)	0.724	0.586
ISI5	Noticeability of sleep problems by others	0.86 (0.97)	1.015	0.711
ISI6	Distress caused by sleep difficulties	0.63 (0.87)	0.877	0.673
ISI7	Interference with daytime functioning	0.65 (0.88)	1.168	0.755
PHQ1	Anhedonia	0.68 (0.76)	0.904	0.600
PHQ2	Sad Mood	0.59 (0.70)	0.958	0.615
PHQ3	Sleep problems	0.58 (0.79)	0.979	0.650
PHQ4	Fatigue	0.75 (0.83)	1.052	0.630
PHQ5	Appetite	0.48 (0.73)	0.794	0.508
PHQ6	Guilt	0.39 (0.74)	0.932	0.566
PHQ7	Concentration	0.38 (0.69)	0.956	0.593
PHQ8	Motor problems	0.27 (0.57)	0.912	0.579
PHQ9	Suicide ideation	0.15 (0.49)	0.591	0.375
GAD1	Nervousness	0.49 (0.66)	0.854	0.611
GAD2	Uncontrollable worry	0.37 (0.64)	0.989	0.658
GAD3	Excessive worry	0.52 (0.72)	1.008	0.685
GAD4	Trouble relaxing	0.50 (0.73)	1.172	0.745
GAD5	Restlessness	0.28 (0.57)	1.022	0.661
GAD6	Irritability	0.45 (0.70)	1.089	0.693
GAD7	Feeling afraid	0.43 (0.66)	0.834	0.595

ISI: Insomnia Severity Index; PHQ-9: the 9-item Patient Health Questionnaire; GAD-7: 7-item Generalized Anxiety Disorder Scale; SD, standard deviation.

^aThe values of expected influence were raw data generated from the network.