Assessment of the Psychometric Properties of the Holland Sleep Disorders Questionnaire in the Iranian Population

Table 5

value, factor loading correlation, and Cronbach’s alpha of the tool items.

Factor	No.	^a	^b	Correlation coefficient	Cronbach’s alpha
Insomnia	H1	7.05		0.46	0.8	0.811
	H7	4.81		0.29	0.83
	H10	11.78		0.61	0.78
	H12	8.40		0.51	0.79
	H13	15.91		0.75	0.75
	H15	15.02		0.72	0.75
	H21	9.17		0.48	0.798
Parasomnia	H4	7.10		0.83	0.9	0.924
	H16	10.01		0.68	0.94
	H20	11.41		0.85	0.897
	H22	7.54		0.423	0.84
	H24	7.19		0.81	0.91
	H31	8.00		0.898	0.895
CRSD	H5	5.40		0.17	0.64	0.701
	H26	1.86		0.21	0.25
	H27	9.17		0.56	0.58
	H30	9.32		0.51	0.32
Hypersomnia	H23	16.37		0.75	0.87	0.893
	H25	13.22		0.73	0.87
	H28	15.82		0.77	0.86
	H29	14.57		0.82	0.86
	H32	11.31		0.65	0.89
RLS/PLMD	H2	12.07		0.61	0.74	0.786
	H6	9.96		0.65	0.73
	H8	7.54		0.58	0.75
	H9	5.73		0.34	0.8
	H11	11.00		0.55	0.75
	H14	12.67		0.58	0.75
SBD	H3	8.45		0.46	0.61	0.745
	H17	5.66		0.55	0.55
	H18	13.7		0.47	0.62
	H19	5.01		0.41	0.65

; ; . ^aThe calculated values of for all factor loadings of the first and second orders are greater than 1.96 and are therefore significant at the 95% confidence level. ^bThe specific value, which is denoted by the Lambda coefficient and the statistical symbol , is calculated from the sum of the factors of the factor loads related to all the variables of that factor. CRSD: Circadian rhythm sleep disorders; RLS: restless legs syndrome; PLMD: periodic limb movement disorder; SDB: sleep-disordered breathing.