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Table 7 Responsiveness: mean change from baseline in PSQ item scores, effect size, and Guyatt's statistic by subject-rated CGI-I at Week 12

From: Validation of the post sleep questionnaire for assessing subjects with restless legs syndrome: results from two double-blind, multicenter, placebo-controlled clinical trials

 

Subject-rated Clinical Global Impression of Change

 

PSQ domains

Very Much

Improved

n = 175

Much Improved

n = 130

Minimally Improved

n = 61

No Change

n = 65

Worse

n = 15

p-value

Sleep quality

      

   Mean delta (SD)

-0.92 (0.77)

-0.68 (0.60)

-0.31 (0.59)

-0.14 (0.56)

0.00 (0.38)

<0.0001

   Guyatt's statistic

1.66

1.23

0.56

0.25

0.00

 

Daytime functioning

      

   Mean delta (SD)

-1.01 (0.92)

-0.68 (0.77)

-0.33 (0.60)

-0.05 (0.80)

-0.13 (0.74)

<0.0001

   Guyatt's statistic

1.27

0.85

0.41

0.06

0.17

 

Nights with RLS symptoms

      

   Mean selta (SD)

-2.74 (0.99)

-1.70 (1.22)

-0.93 (1.06)

-0.25 (0.79)

0.00 (1.41)

<0.0001

   Guyatt's statistic

3.46

2.15

1.18

0.31

0.00

 

RLS-related sleep disturbance

      

   Mean delta (SD)

-1.67 (1.15)

-0.89 (1.01)

-0.48 (0.74)

-0.32 (0.94)

-0.47 (1.19)

<0.0001

   Guyatt's statistic

1.78

0.95

0.51

0.34

0.50

 

RLS-related sleep latency

      

   Mean delta (SD)

-1.82 (1.41)

-0.86 (1.35)

-0.38 (1.20)

-0.32 (1.00)

-0.73 (1.44)

<0.0001

   Guyatt's statistic

1.82

0.86

0.38

0.32

0.73

 
  1. CGI-I, Clinical Global Impression-Improvement, subject-rated; SD = Standard Deviation
  2. Mean delta is change from baseline to Week 12
  3. p-value is based on Kruskal-Wallis test
  4. Effect size based on Cohen's d is the difference in the mean score/pooled standard deviation.
  5. Guyatt's statistic is the ratio of the mean change score for each category of subjects divided by the standard deviation for the no change group.