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Table 5 DIF statistics across men and women

From: Body Appreciation Scale (BAS-2): measurement invariance across genders and item response theory examination

Item number

Total χ2

df

p

χ2a

df

p

χ2cja

df

p

1

14.2

5

0.0142

0.0

1

0.8646

14.2

4

0.0067

2

5.8

5

0.3257

0.9

1

0.3382

4.9

4

0.2992

3

8.0

5

0.1542

5.1

1

0.0238

2.9

4

0.5711

4

3.5

5

0.6186

2.3

1

0.1316

1.3

4

0.8697

5

4.1

5

0.5407

1.2

1

0.2771

2.9

4

0.5785

6

2.9

5

0.7237

1.4

1

0.2439

1.5

4

0.8292

7

2.2

5

0.8201

0.3

1

0.5763

1.9

4

0.7555

8

3.6

5

0.6019

2.1

1

0.1491

1.6

4

0.8167

9

11.7

5

0.0385

5.4

1

0.0201

6.3

4

0.1747

10

2.1

5

0.8314

1.3

1

0.2496

0.8

4

0.9387

Item number

Total χ2

df

p

χ2a

df

p

χ2cja

df

p

DIF statistics including only non-anchored items

1

13.2

5

0.0214

0.0

1

0.9721

13.2

4

0.0102

9

12.5

5

0.0285

6.0

1

0.0142

6.5

4

0.1656

Item number

Group

α

β1

β2

β3

β4

   

BAS-2 Graded Response Model IRT Properties for non-invariant items

1

Men

2.34

 − 2.47

 − 1.23

 − 0.14

1.33

   

1

Women

2.33

 − 2.69

 − 1.59

 − 0.14

0.86

   

9

Men

2.84

 − 1.72

 − 0.76

0.02

1.21

   

9

Women

4.41

 − 1.36

 − 0.57

0.25

0.93

   
  1. Bold values denote significance at .05 and are considered ‘non-anchored items’ in the table immediately below
  2. α defines the capacity of an item to discriminate between varying levels of body appreciation (θ).
  3. β represents the level of latent trait observed to endorse each item at a specific threshold.
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BMC Psychology

ISSN: 2050-7283

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