Researcher Profile

Stephan Ehrhardt

🏛 Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland

Publications

Citations

Co-Authors

Active Years

Publications

Journal Article BMJ Aug 08, 2025

Determining sample size for pilot trials: a tutorial

Xiangji Ying · Kenneth E Freedland · Lynda H Powell · Elizabeth A Stuart +2 more

10.1136/bmj-2024-083405 21 citations

Journal Article JAMA Network Open Sep 14, 2023

Pilot Trial Characteristics, Postpilot Design Modifications, and Feasibility of Full-Scale Trials

Xiangji Ying · Stephan Ehrhardt

10.1001/jamanetworkopen.2023.33642 11 citations

Journal Article Journal of Affective Disorders Mar 01, 2019

Internalizing symptoms in very low birth weight preschoolers: Symptom level and risk factors from four rating perspectives in a controlled multicenter study

Nadine Helle · Claus Barkmann · Stephan Ehrhardt · Axel von der Wense +2 more

10.1016/j.jad.2018.12.025 7 citations

Journal Article Academic Medicine Aug 01, 2018

Why Public Comments Matter: The Case of the National Institutes of Health Policy on Single Institutional Review Board Review of Multicenter Studies

Ann-Margret Ervin · Holly A. Taylor · Stephan Ehrhardt · Curtis L. Meinert

10.1097/acm.0000000000002206 5 citations

Publication Timeline

2025

2023

2019

2018

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