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Given a prevalence of HF in prior studies at 21 58 %, we estimated that a total of 110 dyspneic patients would be necessary to yield 40 patients with HF as a cause for their dyspnea [30 34].
(Using this lower cut-off would have given a prevalence of psychological distress of 71.4%).
Studies based on clinical findings in known sarcoid patients are likely given a prevalence of cardiac involvement in 5% to 10% of affected patients [ 17].
A total of 81 persons with a history of ARF or RHD and taking antibiotic prophylaxis in 2011 were identified in Lifou, given a prevalence of 9.4/1,000 inhabitants.
Given a prevalence of 5%, if we observe a sensitivity of 90% this cohort size will give a 95% confidence interval for this sensitivity of 84.0 to 94.3, and a specificity of 91%.
The study was powered to detect an odds ratio of 2, with a power of 80% at the 5% level of significance, given a prevalence of the risk factor of 20%.
Similar(50)
Of 125 pregnant women tested, 73 had microscopic Plasmodium parasitaemia, giving a prevalence of 58.4%.
A further 28 cases of gestational diabetes were identified, giving a prevalence of 1.2%.
During this period, 50 patients were admitted to the ICU, giving a prevalence of thrombocytopenia of 40%.
In the After group, 23 patients were included between 22 July and 10 September 2012 out of 69 admissions during the same period, giving a prevalence of thrombocytopenia of 33.3 %.
Five held marked questionnaires, giving a prevalence of fever by this definition of 0.5% (5/1063).
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CEO of Professional Science Editing for Scientists @ prosciediting.com