OBJECTIVE: The purpose is to describe an own-developed scale for medication adherence evaluation of HIV patients under antiretroviral therapy, and to compare it with other previously described methods. METHODS: The six-item scale was compared with a pharmacy record about the delivery of medication. Accordance between scale and a four-item Morisky-type scale (measure 1) and a percentage of doses taken as prescribed during the past two weeks (measure 2) was computed. RESULTS: The own-scale showed 93% sensitivity, 70% specificity, a likelihood ratio of 3.08 and good agreement compared with the pharmacy record (k = 0.62, p < 0.001). Agreement between the scale and measure 1 and measure 2 was very weak (k = 0.12, p = 0.446 and k = 0.10, p = 0.273 respectively). 39.7% of patients was considered as adherent according with the own-scale and was observed correlation between adherence and clinical outcomes. CONCLUSION: The scale appears to be a valid instrument to check and detect adherence related problems compared with the pharmacy medication record. Easiness to use make feasible to consider as an adequate tool to detect non-adherent patients or patients with adherence related problems into the daily clinical practice.
OBJECTIVE: The purpose is to describe an own-developed scale for medication adherence evaluation of HIVpatients under antiretroviral therapy, and to compare it with other previously described methods. METHODS: The six-item scale was compared with a pharmacy record about the delivery of medication. Accordance between scale and a four-item Morisky-type scale (measure 1) and a percentage of doses taken as prescribed during the past two weeks (measure 2) was computed. RESULTS: The own-scale showed 93% sensitivity, 70% specificity, a likelihood ratio of 3.08 and good agreement compared with the pharmacy record (k = 0.62, p < 0.001). Agreement between the scale and measure 1 and measure 2 was very weak (k = 0.12, p = 0.446 and k = 0.10, p = 0.273 respectively). 39.7% of patients was considered as adherent according with the own-scale and was observed correlation between adherence and clinical outcomes. CONCLUSION: The scale appears to be a valid instrument to check and detect adherence related problems compared with the pharmacy medication record. Easiness to use make feasible to consider as an adequate tool to detect non-adherent patients or patients with adherence related problems into the daily clinical practice.
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