Skip to main content

Table 2 Physical Domain (10 items) - Overview of final SF-HDQ item level and domain model fit statistics

From: Developing a short-form version of the HIV Disability Questionnaire (SF-HDQ) for use in clinical practice: a Rasch analysis

Item #

Final SF-HDQ items

Item level statistics

Physical domain

Location

SE

Residual

ChiSq χ2

p value

1

Fatigue

− 0.694

0.038

− 0.276

13.544

0.140

3

Nauseaa

0.132

0.044

− 0.748

18.549

0.029

4

Headaches

0.098

0.039

0.361

16.422

0.059

5

Numbness or tingling in hands

0.288

0.039

0.100

8.470

0.488

7

Aches or pains

− 0.441

0.036

− 1.399

21.204

0.012

10

Shortness of breath

0.240

0.041

0.061

15.153

0.087

11

Fever, chills, or sweats

0.162

0.039

− 0.529

18.191

0.033

13

Muscle cramps

0.262

0.040

− 2.120

13.636

0.136

17

Trouble sleeping

− 0.761

0.034

2.141

14.346

0.111

20

Feel dizzy

0.714

0.045

− 1.555

14.747

0.098

Final model: physical domain—10 items (raw score range: 0–39)

 Mean

− 1.137

 Standard deviation

0.980

 Sample size

981

 Chi-square statistic (df) p value

154.2609 (df: 90) p = 0.0003

 Cronbach’s alpha

0.84762

 Person Separation Index

0.79042

 Unidimensionality t-test (% significant)

0.41%

Differential Item Functioning  (DIF)

None

  1. aHDQ3 rescored to 4 response categories (0–3)