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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.

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

Domain 4-Week Recall 1-Week Recall
  n Test-retest p value Intra-class correlationa Pearson correlation n Test-retest p value Intra-class correlationa 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
  1. a Calculated using Shrout-Fleiss reliability: single score statistic.