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Development and application of a new measure of engagement in out-patient HIV care.

Development and application of a new measure of engagement in out-patient HIV care.
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Howarth AR, Burns FM, Apea V, Jose S, Hill T, Delpech VC, Evans A, Mercer CH, Michie S, Morris S, Sachikonye M, Sabin C, , ,


Howarth AR, Burns FM, Apea V, Jose S, Hill T, Delpech VC, Evans A, Mercer CH, Michie S, Morris S, Sachikonye M, Sabin C, , , (click to view)

Howarth AR, Burns FM, Apea V, Jose S, Hill T, Delpech VC, Evans A, Mercer CH, Michie S, Morris S, Sachikonye M, Sabin C, , ,

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HIV medicine 2016 8 18() doi 10.1111/hiv.12427

Abstract
OBJECTIVES
Commonly used measures of engagement in HIV care do not take into account that the frequency of attendance is related to changes in treatment and health status. This study developed a new measure of engagement in care (EIC) incorporating clinical factors.

METHODS
We conducted semi-structured interviews with eight HIV physicians to identify factors associated with the timing of patients’ next scheduled appointments. These factors informed the development of an algorithm to classify each month of follow-up as "in care" (on or before the time of the next expected attendance) or "out of care" (after the time of the next expected attendance). The EIC algorithm was applied to data from the UK Collaborative HIV Cohort (UK CHIC) study, a large clinical cohort study.

RESULTS
The interviews indicated that time to next appointment varied depending on psychosocial and physical comorbidities, and clinical factors (time since diagnosis, AIDS diagnosis, treatment status, CD4 count and viral load). The resulting EIC algorithm was applied to 44 432 patients; 83.9% of the 3 021 224 person-months were "in care". Greater EIC was independently associated with older age, white ethnicity, HIV acquisition through sex between men, current use of antiretroviral therapy (ART), a higher nadir CD4 count, later calendar year and being seen at the clinic for the first time within the last year.

CONCLUSIONS
This algorithm describing engagement in HIV care incorporates a time-updated measure of patients’ treatment and health status. It adds to the options available for measuring this key performance indicator.

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