2.8% is the answer. What is the question and what is the question behind the question?

Affiliations

• ¹ Emergency Medicine, Royal Perth Hospital, The University of Western Australia, Perth, Western Australia, Australia.
• ² Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.
• ³ Emergency Medicine, Lincoln Medical Center, Bronx, New York, USA.
• ⁴ Meta-Research Innovation Center at Stanford (METRICS), Stanford, California, USA.
• ⁵ Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.