Psychometric evaluation of the sleep hygiene index: a sample of patients with chronic pain

Table 2 Forced two-factor solution by principal component with varimax rotation of items from the SHI

	Initial eigenvalues			Extraction sums of squared loadings			Rotation sums of squared loadings
Component	Total	% of variance	Cumulative %	Total	% of variance	Cumulative %	Total
1	3.33	25.59	25.59	3.33	25.59	25.59	2.65
2	1.88	14.42	40.01	1.88	14.42	40.14	2.55
3	1.19	9.15	49.17
4	1.07	8.25	57.42
5	.99	7.60	65.02
6	.95	7.31	72.33
7	.78	6.01	78.34
8	.73	5.65	83.98
9	.59	4.50	88.48
10	.49	3.77	92.26
11	.44	3.36	95.62
12	.32	2.45	98.06
13	.25	1.94	100.00

ISSN: 1477-7525