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Since most surveys focus on estimation, herein we derive sample size formulas for estimation of prevalence and a difference between two prevalences in this design.
In this example, the larger of the two prevalences is 0.80.
Simulations were repeated for these two prevalences with a zero and a large slope for n = 1,000.
Would a ratio of two prevalences (which, inter alia, may conflate incidence and duration of the event) suffice or would its ultimate aim be to estimate risk ratios (CIR) or rate ratios (IDR) given both are recognizably 'true' causal parameters and largely recommended as the appropriate quantities to be attained [ 9, 29]?
Having carried out a survey and estimating the contrast between two prevalences (exposed and unexposed), the researcher will always be in dark as to which time period the risks account for and thus, by extension, the ensuing CIR purportedly emulated by the PR.
Although our study and the just-mentioned one were conducted in rural settings of the Far North region of the country, the striking difference between the two prevalences may be explained by the fact that Tokombéré is a village situated near politically unstable areas of Chad and Nigeria, both presenting a significant rate of emigration and seemingly high HBV prevalence (7-30%) [ 23, 24].
Similar(53)
Although the difference between the correct rejection rate at the two prevalence rates was significant, there was a larger effect of prevalence on hit rate.
To overcome these problems we applied a latent class analysis to the results of two prevalence studies carried out in two neighbouring Northern Italian regions (Lombardy and Veneto) that account for over 50% of the Italian dairy cattle population.
Two prevalence surveys from occupational settings have suggested that HIV may not have such a profound effect on the prevalence of tuberculosis as it does on the incidence [14], [15].
These two prevalence estimates are higher than both prior studies in Viet Nam [ 4, 5].
A P value of 0.09 applies to the comparison of the two prevalence estimates.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com