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Table 6 Day-to-Day Activities Domain (5 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
Day-to-day activities domain Location SE Residual ChiSq χ2 p value
49 Unsteady on my feet − 0.170 0.052 0.837 8.166 0.518
50 Trouble walking 0.554 0.055 1.055 14.058 0.120
53 Trouble doing household chores such as cleaning, doing dishes, laundry, and cooking 0.407 0.052 − 1.374 27.246 0.001a
54 Trouble taking part in leisure or recreation, such as exercise or dancing − 0.647 0.048 − 0.982 14.090 0.119
55 Trouble getting out to do errands, such as grocery shopping, banking, or doctor’s appointments − 0.145 0.049 − 0.069 13.207 0.153
Final model: day-to-day activities domain—5 items (raw score range: 0–20)
 Mean − 1.494
 Standard deviation 1.168
 Sample size 675
 Chi-square statistic (df) p value 76.7660 (df: 45) p = 0.002
 Cronbach’s alpha 0.79477
 Person Separation Index 0.69006
 Unidimensionality t-test (% significant) 0.74%
 Differential Item Functioning (DIF) None
  1. Person Separatoin Index (PSI) approaching the threshold of ≥ 0.70
  2. aSignificant residual (p < 0.006; Bonferroni: 0.05/9) but fit residual F value <  ± 2.5