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Table 2 Item descriptive statistics, confirmatory factor analysis, and internal consistency results of the Disability, aAm, Shoulder and Hand questionnaire (N = 124)

From: Psychometric properties of the Disability of Arm Shoulder and Hand (DASH) in subjects with frozen shoulder: a reliability and validity study

Item labels

Descriptive statistics

 

Confirmatory factor analysis

 

Internal consistency

 

Baseline analysis

 

Final analysis

 

Mean ± SD

 

Factor Loading

SE

Factor Loading

SE

 

ITC

αIID

1. Open a tight or new jar

2.8 ± 1.3

 

0.711

0.045

 

0.724

0.046

 

0.677

0.949

2. Write

1.3 ± 0.6

 

0.529

0.092

 

0.538

0.094

 

0.368

0.951

3. Turn a key

1.6 ± 0.9

 

0.600

0.071

 

0.568

0.075

 

0.473

0.950

4. Prepare a meal

1.7 ± 0.8

 

0.722

0.050

 

0.703

0.054

 

0.621

0.949

5. Push open a heavy door

2.7 ± 1.1

 

0.736

0.043

 

0.751

0.043

 

0.679

0.948

6. Place object on shelf above your head

3.5 ± 1.1

 

0.812

0.033

 

0.822

0.033

 

0.745

0.948

7. Do heavy household chores

3.0 ± 1.1

 

0.801

0.035

 

0.815

0.035

 

0.739

0.948

8. Garden or do yard work

2.8 ± 1.1

 

0.687

0.046

 

0.700

0.047

 

0.643

0.949

9. Make a bed

2.5 ± 1.1

 

0.822

0.032

 

0.837

0.032

 

0.759

0.948

10. Carry a shopping bag or briefcase

2.4 ± 1.1

 

0.785

0.033

 

0.720

0.040

 

0.670

0.949

11. Carry a heavy object (over 10 lbs)

2.8 ± 1.1

 

0.796

0.034

 

0.728

0.042

 

0.693

0.948

12. Change a lightbulb overhead

3.6 ± 1.2

 

0.820

0.031

 

0.831

0.031

 

0.747

0.948

13. Wash or blow dry your hair

2.8 ± 1.3

 

0.704

0.045

 

0.715

0.045

 

0.677

0.949

14. Wash your back

3.9 ± 1.1

 

0.719

0.046

 

0.733

0.047

 

0.653

0.949

15. Put on a pullover sweater

3.0 ± 1.1

 

0.678

0.047

 

0.688

0.047

 

0.621

0.949

16. Use a knife to cut food

1.8 ± 1.0

 

0.654

0.052

 

0.667

0.053

 

0.573

0.949

17. Recreational: little effort

1.6 ± 0.9

 

0.685

0.055

 

0.696

0.056

 

0.533

0.950

18. Recreational: force

3.3 ± 1.2

 

0.686

0.045

 

0.644

0.052

 

0.641

0.949

19. Recreational: free arm movement

3.5 ± 1.1

 

0.715

0.049

 

0.679

0.054

 

0.662

0.949

20. Manage transportation needs

1.4 ± 0.8

 

0.393

0.084

 

0.400

0.085

 

0.287

0.951

21. Sexual activities

1.5 ± 0.5

 

0.438

0.076

 

0.447

0.077

 

0.367

0.951

22. Interference with social activities

2.7 ± 1.0

 

0.714

0.042

 

0.635

0.054

 

0.616

0.949

23. Limitation in work and daily activities

2.6 ± 1.0

 

0.744

0.037

 

0.697

0.043

 

0.678

0.949

24. Arm, shoulder or hand pain

2.9 ± 0.9

 

0.712

0.045

 

0.644

0.053

 

0.643

0.949

25. Pain during activity

2.9 ± 0.8

 

0.704

0.053

 

0.686

0.055

 

0.762

0.948

26. Tingling

1.9 ± 1.0

 

0.530

0.063

 

0.540

0.064

 

0.524

0.950

27. Weakness

2.5 ± 1.0

 

0.594

0.056

 

0.607

0.057

 

0.568

0.949

28. Stiffness

3.1 ± 1.1

 

0.498

0.059

 

0.509

0.060

 

0.463

0.951

29. Sleep difficulty

2.8 ± 1.2

 

0.699

0.051

 

0.662

0.057

 

0.650

0.949

30. Capability and confidence

3.1 ± 1.3

 

0.512

0.066

 

0.484

0.071

 

0.505

0.950

Recommended values

N/A

 

≥ 0.400

N/A

 

≥ 0.400

N/A

 

≥ 0.250

  1. Abbreviations: SD, standard deviation; SE, standard error; ITC, Item-to-total correlation; αIID, Cronbach’s α if item deleted; N/A, not applicable
  2. Notes: statistics values beyond the recommended cut-off are in bold.