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Table 2 Differential Item functioning for gender

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

Main Effect for Gender

Gender-Trait Interaction

 

Males

Females

DF

Prob

Males

Females

DF

Prob

1

0.04015

0.04142

1

0.838742

1.09147

1.12607

9

0.341345

2

1.97595

2.14194

1

0.143738

1.00945

1.09425

9

0.364425

3

8.80378

9.87322

1

0.001733

0.30942

0.34701

9

0.958872

4

33.40524

30.25532

1

0.000016

0.91752

0.831

9

0.587624

5

13.15898

12.5703

1

0.000431

1.95187

1.86455

9

0.054061

6

1.64136

1.94816

1

0.163188

0.74287

0.88173

9

0.541148

7

3.22218

3.97158

1

0.046619

1.51676

1.86952

9

0.053306

8

8.52653

12.92955

1

0.000355

0.47544

0.72096

9

0.689971

9

20.25451

21.9388

1

0.000019

0.1508

0.16334

9

0.997325

10

20.48471

26.80281

1

0.000000

0.03225

0.0422

9

0.999991

11

0.3434

0.3741

1

0.540959

0.93481

1.01839

9

0.423315

12

16.02162

14.70792

1

0.000147

0.41747

0.38324

9

0.943387

13

1.4163

1.16839

1

0.280081

1.29212

1.06595

9

0.385782

14

0.39479

0.59179

1

0.441960

0.79332

1.18918

9

0.298521

  1. Emboldened probabilities show significant DIF. Shaded items are those that were deleted.
  2. Item numbers correspond to the order of items in WEMWBS (additional file 1)