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Coleman et. al., (2009) Patient Perceptions of Obstetrician-gynecologists' Practices Related to HIV Testing. Maternal Child Health Journal 13: 355-363.
What were the objectives and hypothesis of the study?
The Coleman and colleagues (2009) study had four main objectives. The researchers sought to determine (1) the number of patients who were tested for HIV by their obstetrician-gynecologist (OBGYN); (2) investigate the attitudes of knowledge of patients concerning HIV testing and their personal risk status; (3) elucidate the key reasons that lead to declining an HIV test; and (4) examine how patients recall their OBGYN's approach to HIV testing.
The researchers hypothesized that women in their sample who were pregnant, seeking preconception care or who were women with risk factors for HIV infection would demonstrate recall for their OBGYN recommending an HIV test.
What was the overall goal/recommendation of the study?
The studying was predominantly seeking to determine whether or not female patients have good recall for remembering the recommendations made by their OBGYN concerning HIV testing. The study hypothesized that women visiting their OBGYN would remember the information provided by their OBGYN in the process of recommending HIV testing, the but results of the study indicated that that majority of women did not recall this process. The researchers suggest that this lack of recall is indicative of a need to re-examine the process through which OBGYN's approach the topic of HIV testing with their patients (Coleman et al., 2009).
3. State the specific study design that was implemented in this study?
The study design used in this study was a survey. Participants, as well as their OBGYN's were provided with surveys to complete. The sampling procedure was not random (Coleman, 2009).
4. Describe what is a continuous variable and list at least 2 continuous variable used in the article.
A continuous variable is one in which the response can have any possible value (i.e. It is not limited to only whole numbers) (Norusis, 2008). One continuous variable used in this study was age, which can include responses that are not limited to whole numbers. The only other continuous variable addressed in this study was household income, which theoretically can be considered a continuous variable if a participant is allowed to provide an actual response (as opposed to selecting a range of responses, which would make it an ordinal variable). It appears, however, that the authors are treating "pregnancy status" as a continuous variable, as they have tested it using t-tests. In order for this variable to be considered a continuous variable, pregnancy status must refer to more than simply a dichotomous variable of being pregnant, or not pregnant.
5. List all the statistical test that were used in this study, giving a brief definition of each and classify each as either a multivariate or bivariate statistic.
Independent Samples T-Test
An Independent Samples T-Test can be used to compare the means of two separate samples. This test is considered a bivariate test (Urdan, 2005).
Principal Component Analysis
PCA is a form of factor analysis that reduces the number of variables in a data set. It works by creating factors, which are groupings of variables that are correlated with one another. The individual factors then do not correlate with each other. The original variables in the data set will have eigenvalues which indicate the extent to which they correlate with each factor. In general, if a variable has an eigenvalue of 1 or higher, it is usually considered to be a part of that particular factor. This is considered a multivariate procedure (Urdan, 2005).
Linear Regression Analysis
Linear Regression allows researchers to predict one variable (Y) from the value of a separate variable (X), or in some cases, multiple variables. Researchers in this study used both age and pregnancy status to be predictor values of HIV testing. The results of a regression analysis will produce a linear equation that can be used to predict values of Y. The regression conducted in this study was bivariate, or simple regression, as they conducted separate regression analyses for each predictor variable. It is possible, however, to conduct a multiple regression analysis, which would then be a multivariate analysis (Urdan, 2005).
A Chi-Square test is used to test the expected values against the actual values measured in a particular…[continue]
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Patient Perceptions of Maternal HIV Testing Ob-Gyn Maternal HIV Testing Study Coleman et. al., (2009) Patient Perceptions of Obstetrician-gynecologists' Practices Related to HIV Testing. Maternal Child Health Journal 13: 355-363. The study objectives were to identify the percentage of women who had been tested for HIV, explore the perceptions of women patients about HIV testing and ascertain their knowledge about their own HIV risk status, to determine the primary reasons patients refuse to
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