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Completeness of follow-up is important, especially in clinical trials, since unequal follow-up in the treatment groups can bias the analysis of results. In survival studies, information on participants who do not complete the study is often omitted because their data can be included up to the time at which they were lost to follow-up. We propose a simple measure of completeness that is the ratio of the total observed person-time and the potential person-time of follow-up in a study. Our measure is easy to calculate, can be illustrated pictorially, and can be used to identify subgroups with especially poor follow-up.

Type

Journal article

Journal

Lancet

Publication Date

13/04/2002

Volume

359

Pages

1309 - 1310

Keywords

Clinical Trials as Topic, Female, Follow-Up Studies, Humans, Liver Cirrhosis, Biliary, Multiple Myeloma, Ovarian Neoplasms, Survival Analysis