4 research outputs found
Therapeutic non adherence: a rational behavior revealing patient preferences ?
No full textThis paper offers an indirect measure of patient welfare based on whether patients comply with the prescription they receive. Adherence behavior is supposed to reveal patients' subjective valuations of particular therapies. We write a simple theoretical model of patient adherence behavior, that reflects the trade-off between perceived costs and observed regimen efficacy. A discrete choice framework is then used for the estimation, ie the comparison of the incremental benefit of drug intake between two regimens. Consequently, the empirical analysis is based on the identification of patient and drug characteristics associated with adherence. The econometric approach is implemented through a bivariate panel two-equation simultaneous system studying jointly the factors associated with adherence and response to treatment. The data come from a randomized clinical trial conducted in France between 1999 and 2001 and comparing the efficacy of 2 tritherapy strategies in HIV disease. Both the theoretical and empirical results suggest that, for comparable clinical efficacy and toxicity levels, a higher adherence level is associated with higher patient welfare, thus adding valuable information to conclusions drawn by a mere biostatistical analysis. Therefore, from the perspective of the patient, the adherence-enhancing drug must be favored. Our results based on panel data also stress that unobserved patient characteristics account substantially for drug valuation and that the assessment evolves during the course of the treatment. Furthermore, we provide a new framework for the analysis of adherence data. The microeconometric framework highlights that non adherence is an endogenous behavior, thus suggesting new ways for improving adherence.drug valuation method ; revealed preferences ; endogenous adherence behavior ; panel bivariate probit estimation ; HIV
Assessement of Awareness of, Concerns and Attitudes Towards HIV-Related Court-Case Sentences in France in a Representative Sample of People Living with HIV (ANRS VESPA2 Survey)
No full textInternational audienceSome of the 12 criminal trials and sentences in France for HIV transmission in 1998-2011 attracted substantial public attention , with a possible negative impact on people living with HIV (PLWH) through reinforced stigma and discrimination. This analysis aimed to characterize PLWH enrolled in the representative ANRS-VESPA2 survey, aware of and concerned about convictions for HIV transmission. Being a migrant from Sub-Saharan Africa, having difficult socioeconomic conditions, having unprotected sex with one's main partner and concealing one's HIV status were all factors statistically associated with concern about the sentences. Participants tempted to press charges against someone for infecting them were more likely to be younger, women, not living in a couple, unemployed, and to report a major depressive disorder. Concern about HIV-related criminal proceedings among the most vulnerable PLWH do not reflect the actual risk of prosecution they are exposed to. Resumen En Francia, algunos de los 12 juicios y sentencias relacionados con la contaminación del VIH en 1998-2011 suscitaron con-siderablemente el interés público. Esto pudo impactar negativamente las personas viviendo con VIH (PVVIH) aumentando su estigmatización y discriminación. Este análisis busca caracterizar las PVVIH, de la encuesta ANRS-VESPA2, informadas acerca de esos juicios e inquietos por la posibilidad de implicación en uno de ellos. Ser inmigrante subsahariano, las con-diciones socio-económicas desfavorables, las relaciones sexuales no protegidas con la pareja principal, y ocultar el VIH, están asociados a la posibilidad de ser implicados en un juicio. Por otro lado, aquellos que han intentado presentar cargos por contaminación del VIH fueron mayoritariamente jóvenes, mujeres, personas viviendo solas, desempleados, y personas en depresión. Los juicios por contaminación del VIH entre las PVVIH más vulnerables no reflejan el riesgo de acusación al que están expuestos
Human Immunodeficiency Virus Type 1 Group O Infection in France: Clinical Features and Immunovirological Response to Antiretrovirals
No full textInternational audienc
Human Immunodeficiency Virus Type 1 Group O Infection in France: Clinical Features and Immunovirological Response to Antiretrovirals
No full textInternational audienceBackground:To obtain reliable clinical data of human immunodeficiency virus type 1 group O (HIV-1/O) infection, and immunovirological responses to combination antiretroviral therapy (cART), in a large series of 101 patients.Methods:Piecewise linear models were used to estimate CD4 count before and after cART initiation. Kaplan-Meier survival curves were used to estimate time to reach clinical stage C before antiretroviral therapy (ART) and to analyze time to achieve a plasma viral load (pVL) <40 copies/mL following cART initiation. Immunovirological response was assessed at the most recent visit in patients on active follow-up.Results:Data showed a 16.6% cumulative probability of reaching stage C within 5 years following diagnosis, and a mean CD4 decrease of -30.5 cells/μL/year. cART initiation in ART-naive patients led to a mean CD4 gain of 147 cells/μL after 12 months, and to a median pVL of <40 copies/mL after 3.8 months for 89.3%. Initiation with a nonrecommended nonnucleoside reverse transcriptase inhibitor-based vs a ritonavir-boosted protease inhibitor-based regimen resulted in a much smaller gain of around 100 CD4 cells/μL after 1 year. Patients on follow-up since 2007 had a median CD4 count of 498 cells/μL, and 87% had a pVL <40 copies/mL at the most recent follow-up visit.Conclusions:This work provides unique data on HIV-1/O infection, in favor of a milder natural evolution than HIV-1 group M (HIV-1/M) and of a highly efficient current management, based on HIV-1/M guidelines, despite genetic divergence. Studies of comparable HIV-1/M and HIV-1/O populations are needed to confirm these results
