Item # | Final SF-HDQ items | Item level statistics | ||||
---|---|---|---|---|---|---|
Social domain | Location | SE | Residual | ChiSq χ2 | p value | |
58 | Find hard to meet the needs of those I care for | 0.808 | 0.040 | − 0.302 | 11.066 | 0.271 |
62 | Feel work performance limited (0 = not at all or not applicable) | 0.046 | 0.035 | 0.455 | 5.823 | 0.757 |
63 | Struggle to maintain safe and stable housing - DIF(country)a | 0.570 | 0.060 | − 0.297 | 22.579 | 0.007 |
65 | Find it hard to ask others for help when go through an episode of illness - DIF(country) | − 0.310 | 0.034 | − 0.442 | 7.370 | 0.599 |
67 | Find it hard to start new intimate, sexual relationships living with HIV (0 = not at all or not applicable)a | − 0.609 | 0.058 | 2.426 | 8.228 | 0.511 |
68 | Tend to isolate myself from others because I am HIV positive | − 0.172 | 0.034 | − 3.142 | 24.214 | 0.003* |
69 | Find it hard to take part in leisure or recreational things because can’t afford it - DIF(country) | − 0.333 | 0.033 | 0.134 | 6.398 | 0.700 |
Final model: social domain—7 items (raw score range: 0–24) | ||||||
 Mean | − 0.724 | |||||
 Standard deviation | 1.002 | |||||
 Sample size | 943 | |||||
 Chi-square statistic (df) p value | 86.6772 df: 54; p = 0.025679 | |||||
 Cronbach’s alpha | 0.79355 | |||||
 Person Separation Index | 0.74478 | |||||
 Unidimensionality t-test (% significant) | 1.27% | |||||
 Differential Item Functioniong (DIF) | Significant DIF for country (defined as F value significant and > 1.0 logit difference between groups)—3 items (HDQ63; HDQ65; HDQ69)b |