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Table 2 Test re-test reliability of pre-treatment Sleep Quality Scale scores

From: Psychometric properties of a single-item scale to assess sleep quality among individuals with fibromyalgia

Study

Between-Subjects Error Variance

Within-Subject Error Variance

ICC of a Single Daily Score

ICC for the Average of Seven Daily Scores

1056

2.40

1.68

0.59

0.91

1077

2.23

1.69

0.57

0.90

  1. ICC = Intraclass Correlation Coefficient = (Between-Subjects Error Variance)/(Between-Subjects Error Variance + Within-Subject Error Variance)
  2. ICC for the Average of Seven Daily Scores = 7(ICC for single score)/[1 + 6(ICC for a single score)]
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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