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Table 3 Cronbach's alpha and item convergent and discriminant criteria of the MOS-Sleep multi-item scores (N = 381)

From: Evaluation of the reliability and validity of the Medical Outcomes Study sleep scale in patients with painful diabetic peripheral neuropathy during an international clinical trial

Multi-item scores No of items Cronbach's alpha Range of item-scale correlations % of items meeting the convergent criterion % of items meeting the discriminant criterion
Sleep disturbance 4 0.80 0.51–0.76 100% 100%
Somnolence 3 0.74 0.47–0.63 100% 100%
Sleep adequacy 2 0.71 0.55–0.55 100% 100%
Sleep problems index 9 0.81 0.34–0.62 78% (all except items 5 and 9) NA
  1. N = 381 patients with all items completed are included in this analysis; NA = Not Applicable