Reliability of a 1-week recall period for the Medical Outcomes Study Sleep Scale (MOS-SS) in patients with fibromyalgia

Table 2 Test-retest reliability of the Medical Outcomes Study Sleep Scale. Results are for stable subjects, defined as patients who report 'No Change' on Patient Impression of Change sleep question, with non-missing values for both test and retest.

Domain	4-Week Recall				1-Week Recall
	n	Test-retest p value	Intra-class correlation^a	Pearson correlation	n	Test-retest p value	Intra-class correlation^a	Pearson correlation
Sleep disturbance	78	0.1707	0.93	0.93	62	0.2354	0.76	0.76
Snoring	76	0.4385	0.90	0.90	61	0.0800	0.83	0.83
Awakening short of breath or with headache	78	0.7412	0.87	0.87	62	0.6154	0.73	0.73
Sleep adequacy	78	0.2094	0.63	0.64	62	0.3619	0.69	0.69
Daytime somnolence	78	0.0062	0.88	0.89	62	0.1222	0.84	0.84
9-Item Sleep Problems Index	78	0.0100	0.89	0.90	62	0.1088	0.81	0.81