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HIV/AIDS knowledge among men who have sex with men: applying the item response theory.

Gomes RR, Batista JR, Ceccato Md, Kerr LR, Guimarães MD - Rev Saude Publica (2014)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Secretaria Municipal de Saúde de Belo Horizonte, Belo Horizonte, MG, Brasil.

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.

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Related in: MedlinePlus

Total Information curve (10 items).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4206150&req=5

f02: Total Information curve (10 items).

Mentions: Figure 2 presents a graphical representation ofthe total information curve, i.e., the sum of all information functions, for all theten items. Overall, the curve indicates that the 10 items provided betterdifferentiation among individuals who are below the midpoint on the knowledge scale.For individuals with levels above the average, the items have little discrimination,producing most of the information error, as seen by the standard error curve (dottedline). In addition, there was no measurable knowledge score above six on thescale.


HIV/AIDS knowledge among men who have sex with men: applying the item response theory.

Gomes RR, Batista JR, Ceccato Md, Kerr LR, Guimarães MD - Rev Saude Publica (2014)

Total Information curve (10 items).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4206150&req=5

f02: Total Information curve (10 items).
Mentions: Figure 2 presents a graphical representation ofthe total information curve, i.e., the sum of all information functions, for all theten items. Overall, the curve indicates that the 10 items provided betterdifferentiation among individuals who are below the midpoint on the knowledge scale.For individuals with levels above the average, the items have little discrimination,producing most of the information error, as seen by the standard error curve (dottedline). In addition, there was no measurable knowledge score above six on thescale.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Secretaria Municipal de Saúde de Belo Horizonte, Belo Horizonte, MG, Brasil.

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.

Show MeSH
Related in: MedlinePlus