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Table 5 Uncertainty 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
Uncertainty domain Location SE Residual ChiSq χ2 p value
35 Worry about future health living with HIV − 0.114 0.041 − 1.295 25.455 0.002a
36 Worry about lab test results such as my CD4 count and viral load 0.701 0.041 0.084 13.146 0.156
39 Worry about the side effects of HIV treatments 0.069 0.038 0.793 5.110 0.825
40 Worry about income or financial security living with HIV − 0.608 0.035 0.900 6.796 0.658
41 Worry what might happen to my family and friends if have an episode of illness − 0.048 0.037 0.618 7.220 0.614
Final model: uncertainty domain—5 items (raw score range: 0–20)
 Mean − 0.366
 Standard deviation 1.190
 Sample size 930
 Chi-square statistic (df) p value 58.7265 (df: 45) p = 0.0965b
 Cronbach’s alpha 0.82314
 Person Separation Index 0.78006
 Unidimensionality t-test (% significant) 1.72%
Differential Item Functioning (DIF)  None
  1. aSignificant residual (p < 0.004; Bonferroni: 0.05/14) but fit residual F value <  ± 2.5
  2. bChi-square statistic not significant (ideal outcome). HDQ43—removed as this item considered to be captured by HDQ35 worry about future health