Table 7.
Social Inclusion Domain (7 items) - Overview of final SF-HDQ item level and domain model fit statistics
| 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 | |||||
*Residuals: HDQ68 (isolate self)—significant residual > -2.5 (p < 0.004; Bonferroni: 0.05/11). This item may be referring to a ‘strategy’ (isolating self) that may lead to challenges to social inclusion rather than social inclusion itself. However we retained due to clinical importance, and because if we remove this item from the model, it worsens fit (PSI = 0.676; model not shown)
Rescoring: aRescored to 3 response categories (0–2)—HDQ63 and HDQ67 to achieve ordered thresholds
HDQ61: deleted because captured in HDQ62—which describes limitations rather than prevention (all or nothing)
bDifferential Item Functioning (DIF): Significant DIF for HDQ63, HDQ65, and HDQ69. Items retained given clinical importance and expected cultural differences related to disability between samples of Canadian and Irish participants