RT Journal Article SR Electronic T1 Estimating the sensitivity of a screening test. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 364 OP 366 DO 10.1136/jech.39.4.364 VO 39 IS 4 A1 N E Day YR 1985 UL http://jech.bmj.com/content/39/4/364.abstract AB A commonly used estimate of a screening test's sensitivity, based on the prevalence at screening and the incidence of interval cancers, is shown to be logically unsound and quantitatively poor. An alternative simple estimate is proposed, based only on incidence rates.