RT Book, Section A1 Briel, Matthias A1 Montori, Victor M. A1 Durieux, Pierre A1 Devereaux, PJ A1 Guyatt, Gordon A2 Guyatt, Gordon A2 Rennie, Drummond A2 Meade, Maureen O. A2 Cook, Deborah J. SR Print(0) ID 1183876027 T1 The Principle of Intention to Treat and Ambiguous Dropouts T2 Users' Guides to the Medical Literature: A Manual for Evidence-Based Clinical Practice, 3rd ed YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 978-0-07-179071-0 LK jamaevidence.mhmedical.com/content.aspx?aid=1183876027 RD 2024/04/19 AB Reports of randomized clinical trials (RCTs) frequently refer to “dropouts” from the study. Unfortunately, RCT authors may be referring to 1 of 2 different phenomena. The first phenomenon includes study participants who no longer comply with the intervention (typically the experimental treatment and typically a drug) but who are willing to continue with follow-up for the outcome events of interest. The second phenomenon includes study participants who, for a number of possible reasons (eg, moved away or refused further participation), are no longer available and are thus lost to follow-up.