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1.
Rev Saude Publica ; 48(2): 206-15, 2014 Apr.
Article in English | MEDLINE | ID: mdl-24897041

ABSTRACT

OBJECTIVE: To evaluate the level of HIV/AIDS knowledge among men who have sex with men in Brazil using the latent trait model estimated by Item Response Theory. METHODS: Multicenter, cross-sectional study, carried out in ten Brazilian cities between 2008 and 2009. Adult men who have sex with men were recruited (n = 3,746) through Respondent Driven Sampling. HIV/AIDS knowledge was ascertained through ten statements by face-to-face interview and latent scores were obtained through two-parameter logistic modeling (difficulty and discrimination) using Item Response Theory. Differential item functioning was used to examine each item characteristic curve by age and schooling. RESULTS: Overall, the HIV/AIDS knowledge scores using Item Response Theory did not exceed 6.0 (scale 0-10), with mean and median values of 5.0 (SD = 0.9) and 5.3, respectively, with 40.7% of the sample with knowledge levels below the average. Some beliefs still exist in this population regarding the transmission of the virus by insect bites, by using public restrooms, and by sharing utensils during meals. With regard to the difficulty and discrimination parameters, eight items were located below the mean of the scale and were considered very easy, and four items presented very low discrimination parameter (< 0.34). The absence of difficult items contributed to the inaccuracy of the measurement of knowledge among those with median level and above. CONCLUSIONS: Item Response Theory analysis, which focuses on the individual properties of each item, allows measures to be obtained that do not vary or depend on the questionnaire, which provides better ascertainment and accuracy of knowledge scores. Valid and reliable scales are essential for monitoring HIV/AIDS knowledge among the men who have sex with men population over time and in different geographic regions, and this psychometric model brings this advantage.


Subject(s)
Acquired Immunodeficiency Syndrome/prevention & control , HIV Infections/prevention & control , Health Knowledge, Attitudes, Practice , Homosexuality, Male , Acquired Immunodeficiency Syndrome/transmission , Adult , Brazil , Cross-Sectional Studies , HIV Infections/transmission , Humans , Male , Socioeconomic Factors , Surveys and Questionnaires
2.
Rev. saúde pública ; Rev. saúde pública;48(2): 206-215, abr. 2014. tab, graf
Article in English | LILACS | ID: lil-711847

ABSTRACT

OBJECTIVE To evaluate the level of HIV/AIDS knowledge among men who have sex with men in Brazil using the latent trait model estimated by Item Response Theory. METHODS Multicenter, cross-sectional study, carried out in ten Brazilian cities between 2008 and 2009. Adult men who have sex with men were recruited (n = 3,746) through Respondent Driven Sampling. HIV/AIDS knowledge was ascertained through ten statements by face-to-face interview and latent scores were obtained through two-parameter logistic modeling (difficulty and discrimination) using Item Response Theory. Differential item functioning was used to examine each item characteristic curve by age and schooling. RESULTS Overall, the HIV/AIDS knowledge scores using Item Response Theory did not exceed 6.0 (scale 0-10), with mean and median values of 5.0 (SD = 0.9) and 5.3, respectively, with 40.7% of the sample with knowledge levels below the average. Some beliefs still exist in this population regarding the transmission of the virus by insect bites, by using public restrooms, and by sharing utensils during meals. With regard to the difficulty and discrimination parameters, eight items were located below the mean of the scale and were considered very easy, and four items presented very low discrimination parameter (< 0.34). The absence of difficult items contributed to the inaccuracy of the measurement of knowledge among those with median level and above. CONCLUSIONS Item Response Theory analysis, which focuses on the individual properties of each item, allows measures to be obtained that do not vary or depend on the questionnaire, which provides better ascertainment and accuracy of knowledge scores. Valid and reliable scales are essential for monitoring HIV/AIDS knowledge among the men who have sex with men population over time and in different geographic regions, and this psychometric model brings this advantage. .


OBJETIVO Avaliar o nível de conhecimento de HIV/Aids entre homens que fazem sexo com homens no Brasil, utilizando o modelo de traço latente da Teoria de Resposta ao Item. MÉTODOS Estudo multicêntrico, transversal, que ocorreu entre 2008 e 2009 em 10 cidades brasileiras. Foram recrutados 3.746 homens que fazem sexo com homens pela técnica amostral Respondent Driven Sampling. O conhecimento em HIV/Aids foi apurado a partir de dez afirmativas da entrevista realizada face a face e os escores foram obtidos utilizando o modelo logístico de dois parâmetros (discriminação e dificuldade) da Teoria de Resposta ao Item. O funcionamento diferencial dos itens foi verificado, analisando as curvas características dos itens pela idade e escolaridade. RESULTADOS Os escores de conhecimento estimados pela Teoria de Resposta ao Item não ultrapassaram o valor 6,0 (escala de 0-10), com média e mediana de 5,0 (DP = 0,9) e 5,3, respectivamente, e com 40,7% da amostra com níveis de conhecimento abaixo da média. Algumas crenças ainda existem nessa população sobre a transmissão do vírus por picadas de insetos, pelo uso de banheiros públicos e pelo compartilhamento de utensílios durante as refeições. Com relação aos parâmetros dificuldade e discriminação, oito itens ficaram abaixo da média da escala de conhecimento e considerados muito fáceis, e quatro itens apresentaram parâmetros de discriminação muito baixos (< 0,34). A ausência de itens difíceis contribuiu para a imprecisão da medida do conhecimento entre aqueles com nível médio e superior. CONCLUSÕES A análise da Teoria de Resposta ao Item, centrada nas propriedades individuais de cada item, permite a obtenção de medidas que não variam ou dependem do questionário utilizado, o que proporciona ...


Subject(s)
Adult , Humans , Male , Acquired Immunodeficiency Syndrome/prevention & control , HIV Infections/prevention & control , Health Knowledge, Attitudes, Practice , Homosexuality, Male , Acquired Immunodeficiency Syndrome/transmission , Brazil , Cross-Sectional Studies , HIV Infections/transmission , Surveys and Questionnaires , Socioeconomic Factors
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