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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)