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Table 1 Baseline patient characteristics and sleep scores

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

Characteristics Study 1056 (N = 748) Study 1077 (N = 745)
  n % n %
Gender     
    Male 42 5.6 41 5.5
    Female 706 94.4 704 94.5
Race     
    White 675 90.2 678 91.0
    Black 35 4.7 33 4.4
    Other 38 5.1 34 4.6
  N Mean ± SD N Mean ± SD
Age (years) 748 48.8 ± 10.9 745 50.1 ± 11.4
Duration of FM Prior to Study Start (months) 747 111.7 ± 95.0 745 120.2 ± 96.2
Number of Painful Tender Points a 719 17.1 ± 1.6 723 16.9 ± 1.8
Baseline Mean Pain Score b 748 7.1 ± 1.3 745 6.7 ± 1.3
Sleep Quality Scale b 748 6.7 (1.7) 745 6.2 (1.6)
MOS Sleep Scales     
    Sleep Disturbance 744 67.8 ± 23.4 740 60.0 ± 24.9
    Snoring 726 40.6 ± 35.9 717 36.7 ± 34.6
    Awaken Short of Breath or with Headache 744 37.6 ± 31.1 743 32.3 ± 32.0
    Quantity of Sleep 747 5.4 ± 1.6 744 5.6 ± 1.6
    Sleep Adequacy 745 20.6 ± 22.0 744 23.7 ± 23.2
    Somnolence 743 50.3 ± 24.1 740 42.1 ± 23.1
    Sleep Problems Index (9-item) 741 65.0 ± 16.3 736 58.3 ± 17.7
  1. SD = Standard Deviation
  2. a Total number of tender points with value >0 at randomization; the number is missing if any of 18 tender points is missing.
  3. b Baseline = Last 7 available pain scores before taking study medication up to and including Day1. If fewer than 7 scores are available then baseline consists of all scores that are available.