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Table 5 Differential Item Functioning (DIF) by gender

From: Validation of the German version of the Family Reported Outcome Measure (FROM-16) to assess the impact of disease on the partner or family member

Test all items, anchor all items. DIF Statistics for Graded Items

Item numbers and description in:

Group 1

Group 2

Total X2

d.f

p

X2a

d.f

p

X2c|a

d.f

p

1. I feel worried

1

1

1.3

3

0.7370

0.9

1

0.3349

0.3

2

0.8455

2. I feel angry

2

2

2.8

3

0.4297

0.4

1

0.5332

2.4

2

0.3054

3. I feel sad

3

3

4.5

3

0.2100

1.5

1

0.2230

3

2

0.2187

4. I feel frustrated

4

4

1.1

3

0.7806

0.1

1

0.7755

1

2

0.6054

5. It is difficult to find someone to talk to

5

5

1.1

3

0.7715

0.3

1

0.5634

0.8

2

0.6742

6. Caring for my family member is difficult

6

6

0.7

3

0.8768

0.7

1

0.4138

0

2

0.9920

7. It is hard to find time for myself

7

7

1.1

3

0.7810

0.1

1

0.8194

1

2

0.5971

8. My every day travel is affected

8

8

1.7

3

0.6403

0.4

1

0.5501

1.3

2

0.5151

9. My eating habits are affected

9

9

4.1

3

0.2515

0.1

1

0.8035

4

2

0.1322

10. My family activities are affected

10

10

2

3

0.5747

1.3

1

0.2592

0.7

2

0.6998

11. I experience problems with going on holiday

11

11

2.5

3

0.4713

1.6

1

0.2082

0.9

2

0.6264

12. My sex life is affected

12

12

4.2

3

0.2435

0

1

0.8998

4.2

2

0.1242

13. My work or study is affected

13

13

4.4

3

0.2195

2.5

1

0.1177

2

2

0.3736

14. My relationships with other family members are affected

14

14

0.3

2

0.8460

0.1

1

0.7198

0.2

1

0.6503

15. My family expenses are increased

15

15

1.5

3

0.6919

0.5

1

0.4871

1

2

0.6143

16. My sleep is affected

16

16

2.7

3

0.4495

1.5

1

0.2142

1.1

2

0.5768

  1. p values are for the Wald χ2-statistic that tests the difference between reference and focal group item parameters
  2. χ2a for slope (discrimination)
  3. χ2c/a for location
  4. Significant DIF = p < 0.05