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Table 1 Fit of data to the Rasch model.

From: Internal construct validity of the Warwick-Edinburgh Mental Well-being Scale (WEMWBS): a Rasch analysis using data from the Scottish Health Education Population Survey

 

Item

Person

Chi Square Interaction

PSI

Unidimensional

t-tests (Confidence intervals)

Analysisμ

Mean

SD

Mean

SD

Value

(df)

p

  

1

0.102

3.111

-0.533

1.730

312.1

(126)

0.000

0.906

11.68%

(10–13%)

2

0.102

2.084

-0.504

1.555

178.9

(99)

0.000

0.879

9.15%

(8–11%)

3

0.143

1.580

-0.491

1.448

114.2

(85)

0.009

0.872

7.03%

(6–9%)

4

0.080

1.794

-0.472

1.295

87.19

(63)

0.023

0.840

4.17%*

5

0.065

1.341

-0.475

1.222

64.70

(54)

0.151

0.845

4.18%*

6

0.126

0.681

-0.472

1.223

41.1

(54)

0.901

0.837

4.77%*

7

0.113

1.436

-0.437

1.194

56.5

(54)

0.382

0.854

5.15%

(3–7%)

8

0.078

2.036

-0.540

1.743

208.7

(126)

0.000

0.903

11.77%

(10–13%)

9

0.262

2.372

-0.472

1.656

233.3

(126)

0.000

0.910

10.67%

(9–12%)

  1. * Confidence intervals not relevant where values are <5%
  2. μKey to analysis
  3. 1 14 items
  4. 2 11 items
  5. 3 9 items
  6. 4 7 items
  7. 5 7 items DIF cancelled
  8. 6 Analysis 5 tested on sample 1
  9. 7 Analysis 5 tested on sample 2
  10. 8 14 items males
  11. 9 14 items females