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Table 3 Item fit statistics for the 2-factor, 13-item Patient Perception Measure – Osteopathy (PPM-O13)

From: Exploring the construct validity of the Patient Perception Measure – Osteopathy (PPM-O) using classical test theory and Rasch analysis

 

Response options

Location

Fit residual

Chi-square

Probability

Education & effectiveness

     

1. The way my osteopath answers all of my questions is

Poor, fair, good, very good, excellent

−1.307

−1.157

9.672

0.007

2. The instructions my osteopath gives me regarding my home exercise program are

Poor, fair, good, very good, excellent

0.581

0.776

3.696

0.157

3. Osteopathic treatment has helped my condition

Never, rarely, sometimes, mostly, always

−1.050

−0.071

3.230

0.198

4. As a result of osteopathic treatment, my general health is

Poor, fair, good, very good, excellent

−0.136

−0.091

0.300

0.860

5. During my treatment, the questions my osteopath asked were

Poor, fair, good, very good, excellent

−1.024

−0.608

7.443

0.024

6. After my osteopathic treatment I felt like my whole body was treated rather than just one area

Never, rarely, sometimes, mostly, always

0.495

1.029

4.701

0.095

7. Osteopaths at this clinic talk about the body’s ability to heal itself

Never, rarely, sometimes, mostly, always

1.828

0.863

0.485

0.784

8. I feel calmer after my osteopathic treatment

Never, rarely, sometimes, mostly, always

0.917

0.853

4.371

0.112

9. How helpful is osteopathic treatment in managing your condition

Poor, fair, good, very good, excellent

−0.303

−0.269

2.031

0.362

Cognition & Fatigue

     

10. Osteopathic treatment makes me feel vague

Never, rarely, sometimes, mostly, always

−0.146

0.913

3.192

0.202

11. I cannot focus on tasks after my osteopathic treatment

Never, rarely, sometimes, mostly, always

−0.355

−1.429

2.966

0.226

12. I feel tired after osteopathic treatment

Never, rarely, sometimes, mostly, always

−0.872

1.225

3.126

0.209

13. I find it hard to concentrate after my osteopathic treatment

Never, rarely, sometimes, mostly, always

1.373

−0.745

2.536

0.281

  1. Note: negatively phrased items are in italics and require rescoring prior to analysis.
  2. Legend – response option scoring.
  3. Poor (1), fair (2), good (3), very good (4), excellent (5).
  4. Never (1), rarely (2), sometimes (3), mostly (4), always (5).
  5. NB these scores are reversed for negatively phrased items.