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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