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Sample size considerations for studies comparing survival curves using historical controls.

Abstract：

:Formulas are derived for determination of the number of patients needed in a prospective comparison of survival curves, when the control group patients have already been followed for some period. Although an explicit formula for the required sample size is not available, the computing is straightforward, and tables of examples are presented. Situations are described when one might need to allocate some new patients to the control group, rather than exclusively to the experimental group.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Dixon DO,Simon R

doi

10.1016/0895-4356(88)90025-x

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

1209-13

issue

12

eissn

0895-4356

issn

1878-5921

pii

0895-4356(88)90025-X

journal_volume

41

pub_type

临床试验,杂志文章

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