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Table 6 Scale reliability and homogeneity

From: Health-Related Quality of Life in people with Multiple Sclerosis: How does this Population Compare to Population-based Norms in Different Health Domains?

Data quality indicators

 

Satisfactory

Norms

1. Completeness of Data…………………

Items with 5% or more missing values:

NONE

99.6%

YES

90

2. Responses within Range……………….

Items with 5% or more out-of-range values:

NONE

100.0%

YES

100

3. Consistent Responses…………………

92.5%

YES

90

4. Estimable Scale Scores………………….

   

Estimable without MDE

96.7%

YES

90

Estimable with Half-Scale MDE

100.0%

  

Estimable with Full MDE

100.0%

  

5. Item Internal Consistency

Items that failed internal consistency test:

NONE

100.0%

YES

90

6. Discriminant Validity

Items that failed discriminant validity test:

MH03

99.6%

YES

80

7. Reliable Scales

Scales that failed reliability criteria:

NONE

   

Scale

K

Rtt

Rii

PF—Physical Functioning

10

0.948

0.644

RP—Role Physical

4

0.945

0.810

BP—Bodily Pain

2

0.914

0.841

GH—General Health

5

0.827

0.489

VT—Vitality

4

0.883

0.654

SF—Social Functioning

2

0.784

0.645

RE—Role Emotional

3

0.900

0.749

MH—Mental Health

5

0.875

0.583

  1. k = Number of Items
  2. Rtt = Cronbach's Alpha
  3. Rii = Average inter-item correlation