Original articleSample size determination in case-control studies: The influence of the distribution of exposure
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Association of health and lifestyle factors with uterine fibroids among Saudi women: A case–control study
2022, Journal of Taibah University Medical SciencesCitation Excerpt :The sample size was calculated with OpenEpi (Open Source Epidemiologic Statistics for Public Health Version 2.3.1) by using the methods of Kelsey et al. and Fleiss, with a continuity correction (see Supplementary file).19,20 Assuming a 95% confidence level (Zα), power (1-β) of 80% (Zβ), ratio of controls to cases: 1:1 (r), proportion of controls exposed to diabetes of 13.8% (P1),21 hypothetical proportion of cases exposed to diabetes of 24.25% (P2) and odds ratio of 2.0,22 we calculated necessary sample sizes of 239 cases and 239 controls. Cases were defined as women with a confirmed UF diagnosis identified by a radiologist through lower abdominal ultrasound examination or pelvic ultrasound.
The effect of exposure variance and exposure measurement error on study sample size: Implications for the design of epidemiologic studies
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1991, Journal of Clinical EpidemiologySample size determination in case-control studies
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2019, Statistical Methods in Medical Research
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Present address: Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90007, U.S.A.