Details of construct validity analysis. (DOCX 229 kb

Ahmed Bayoumi (3435854)

Colm Bergin (277802)

Kelly OâBrien (3435863)

Nkem Iku (3435857)

Patricia Solomon (3435848)

Paul Stratford (3435851)

SiobhĂĄn OâDea (3435866)

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Additional file 1: of Reliability and validity of a new HIV-specific questionnaire with adults living with HIV in Canada and Ireland: the HIV Disability Questionnaire (HDQ)

Background: Our aim was to assess internal consistency reliability, construct validity, and test-retest reliability of the
HDQ with adults living with HIV in Canada and Ireland.
Methods: We recruited adults 18 years of age or older living with HIV from hospital clinics and AIDS service
organizations in Canada and Ireland. We administered the HDQ paired with reference measures (World Health
Organization Disability Assessment Schedule, SF-36 Questionnaire, Medical Outcomes Study Social Support Survey), and
a demographic questionnaire. We calculated HDQ disability presence, severity and episodic scores (scored from 0–100).
We calculated Cronbach’s alpha and Intraclass Correlation Coefficients (ICC) (Canada only) for the disability severity and
episodic scores and considered coefficients >0.80 and >0.70 as acceptable, respectively. To assess construct validity, we
tested 40 a priori hypotheses of correlations between scores on the HDQ and reference measures and two known
group hypotheses comparing HDQ presence and severity scores based on age and comorbidity. We considered
acceptance of at least 75 % of hypotheses as demonstrating support for construct validity.
Results: Of the 235 participants (139 Canada; 96 Ireland), the majority were men (74 % Ireland; 82 % Canada) and were
taking antiretroviral therapy (88 % Ireland; 91 % Canada). Compared with Irish participants, Canadian participants were
older (median age: 48 versus 41 years) and reported living with a higher median number of comorbidities (4 versus 1).
Cronbach’s alpha for Irish and Canadian participants were 0.97 (95 % confidence interval (CI): 0.97–0.98) and 0.96
(95 % CI: 0.95–0.98), respectively, for the severity scale and 0.98 (95 % CI: 0.97–0.98) and 0.96 (95 % CI: 0.95–0.98),
respectively, for the episodic scale. Of the 40 construct validity correlation hypotheses, 32 (80 %) and 22 (55 %) were
supported among the Canadian and Irish samples respectively; both (100 %) known group hypotheses were also
supported. ICC values for Canadian participants ranged from 0.80 (95 % CI: 0.71, 0.86) in the cognitive domain to 0.89
(95 % CI: 0.83, 0.92) in the social inclusion domain.
Conclusions: The HDQ demonstrates internal consistency reliability and a variable degree of construct validity when
administered to adults living with HIV in Canada and Ireland. The HDQ demonstrates test-retest reliability when
administered to adults with HIV in Canada. Further validation of the HDQ outside of Canada is needed

O'Brien, Kelly

Solomon, Patricia

Bergin, Colm

O’Dea, Siobhán

Stratford, Paul

Iku, Nkem

Bayoumi, Ahmed M.

TSpace Repository

Reliability and validity of a new HIV-specific questionnaire with adults living with HIV in Canada and Ireland: the HIV Disability Questionnaire (HDQ)

University of Toronto Research Repository

http://dx.doi.org/10.1186/s12955-015-0310-9

Additional file 1: of Reliability and validity of a new HIV-specific questionnaire with adults living with HIV in Canada and Ireland: the HIV Disability Questionnaire (HDQ)

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