RT Journal Article SR Electronic T1 Statistics: an introduction to basic principles JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 793 OP 798 DO 10.1136/postgradmedj-2020-139446 VO 98 IS 1164 A1 Welsby, Philip D A1 Weatherall, Mark YR 2022 UL http://pmj.bmj.com/content/98/1164/793.abstract AB The essential principles of statistics as applied to surveys, studies, sampling, epidemiology, screening, and trials are described and explained.