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Table 1 Fit of the LW-CI-PD dimensions to the Rasch model (results for Acceptance, Coping and Integration dimensions are shown.after model modifications)

From: Rasch analysis of the living with chronic illness scale in Parkinson’s disease

 

Ideal values

Acceptance

Coping

Self-management

Integration

Adjustment to the disease

Number of items

  

3

6a

4

4

6

Item residual

Mean

0

0.175

0.366

0.283

0.238

0.795

SD

1

1.011

1.248

1.358

1.203

1.149

Person residual

Mean

0

−0.209

−0.565

0.972

0.748

0.249

SD

1

2.167

1.577

1.688

1.562

1.141

Chi-square

Value

 

17.296

33.471

29.21

28.232

43.206

Prob.

> 0.05/number of items

0.134

0.015

0.0006

0.0297

0.000146

PSI

 

> 0.70

0.798

0.765

0.67

0.728

0.663

Unidimensional test CI test Binomial

 

(LCI < 0.05)

0.0401

(0.016, 0.064)

0.0216

(−0.002, 0.045)

0.0185

(−0.005, 0.042)

0.0401 (0.016–0.64)

0.0154

(− 0.008, 0.039)

  1. SD Standard deviation, PSI Person separation index, Prob. probability, CI Confidence interval, LCI Lower confidence interval
  2. a Included two items 9, for younger and older adults Unidimensionality results before splitting item 9