Sample Size Calculation Guide - Part 2: How to Calculate the Sample Size for an Independent Cohort Study
Journal Title: Advanced Journal of Emergency Medicine - Year 2019, Vol 3, Issue 1
Abstract
In the previous article, we explained how to calculate the sample size for a cross-sectional study based on a rate or a single proportion. In this article, we will explain how to calculate the sample size for an independent cohort study based on a comparison of two proportions representing the event rates in both the exposed and the non-exposed groups.
Authors and Affiliations
Nadien Khaled Fahim, Ahmed Negida
Non-ST-Elevation Myocardial Infarction in a Case of Von Willebrand Disease: a Case Report
Introduction: Studies have shown that patients with Von Willebrand disease (VWD) have decreased prevalence of thrombotic events like myocardial infarction (MI). Here we describe a case of VWD with acute non-ST-elevation...
Dr. Naeem Toosy, MBChB, MSc, FRCS (Ed), FRCEM; Consultant and Acting Head of Department of Emergency Medicine at Sheikh Khalifa General Hospital
Would you please briefly provide your biography? I was born in the UK to parents of Indo-Pakistani Kashmiri and Persian ancestry. My father was an orthopedic surgeon trained in the UK who was one of the pioneers of moder...
Causes of Prolonged Emergency Department Stay; a Cross-sectional Action Research
Introduction: Based on the existing standards, patients presenting to emergency department (ED) should receive a decision in a maximum of 6 hours after admission to ED and leave ED in this time. Unfortunately, most of th...
A 58-Year-Old Woman with Weakness and Shortness of Breath
The patient was a 58-year-old woman with a history of mitral valvuloplasty, presenting to the emergency department (ED) due to weakness and shortness of breath. Her vital signs were stable. The patient’s electrocardiogra...
Pain Relieving Effect of Sublingual Glycerol Trinitrate in Renal Colic: a Randomized Placebo-Controlled Trial
Introduction: Renal colic is caused by colicky spasms of ureters. As has been shown in previous experiments, glycerol trinitrate (TNG) can inhibit these muscular spasms. Objective: This study was performed to assess the...