![]() ![]() As shown in Figure 3, the results table shows a sample size of 362 participants corresponding with a 95% confidence level. Therefore, the sample size calculation required for this study will be 362 patients (181 patients per group). Chapter 15 a STATCALC : a Statistical Calculator for Single and Stratified Tables Tutorial Run STATCALC from the EPI menu. Under StatCalc calculator you can select various types of data. Statcalc so that it can also be used with OpenEpi, the Windows equivalent of the DOS. Finally, submit the data and check the table for the calculation results. Logistics regression Complex sample frequencies Complex sample means Complex sample tables. Epi Info Course I (Introduction to Public Health Computing with Epi. Then, select “unmatched case-control studies” ( Figure 2). ![]() 65 women are needed in each group, in order to be 95 confident of a real difference between the two groups. ![]() The app controls and facilitates user inputs by taking advantage of the iPads touchscreen interface and using input devices such as sliders and steppers. STATCALC - Calculates statistics from table values entered from the keyboard. Each calculator has been adapted for iOS and is included in this app. This manual provides several different approaches for learning Epi Info. The following steps will show how to calculate the sample size for a case-control study in order to detect a similar odds ratio with 90% statistical power and a 5% margin of error.Ĭalculations will be done by the Epi Info, a program developed by the Centers for Disease Control and Prevention available via the link: First, open the software then select “STATCALC” for sample size calculation options ( Figure 1). with Statcalc (EpiInfo Version 6) reveal that. StatCalc statistical calculators have long been a feature of CDCs Epi Info desktop software. ![]() Each calculator has been adapted for iOS and is included in this. showed that the odds ratio of association between exposure to HCV infection and developing OLP was 9.7 with a 1/101 prevalence rate of HCV among the control group (healthy population) ( 3). StatCalc statistical calculators have long been a feature of CDCs Epi Info desktop software. Therefore, we will identify two groups from the population (cases: patients with OLP and control group: subjects without OLP).Ī previous study by Manomaivat et al. – Open source web tool that provides additional epidemiologic statistics.EXAMPLE: A CASE-CONTROL STUDY ABOUT THE ASSOCIATION BETWEEN HCV INFECTION AND ORAL LICHEN PLANUSĪssume that we will conduct a case-control study to investigate the association between HCV infection and Oral Lichen Planus (OLP).
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