Confounding by indication: the case of calcium channel blockers.

Abstract:

PURPOSE:To review conceptual issues regarding confounding by indication in the context of studies of calcium channel blockers (CCBs). METHODS:Review of literature, with special attention to two articles in the current issue. RESULTS:Conflicting arguments about the presence of uncontrollable confounding by indication in studies of CCBs are reviewed and criticized. Studies with potential confounding by indication can benefit from appropriate analytic methods, including separating the effects of a drug taken at different times, sensitivity analysis for unmeasured confounders, and instrumental variables and G-estimation. CONCLUSIONS:Whether confounding by indication accounts for observed associations is often difficult to determine; this is the case in studies of CCBs. When confounding by indication is suspected, a variety of methods to deal with it may be useful. Copyright (c) 2000 John Wiley & Sons, Ltd.

authors

Joffe MM

doi

10.1002/(SICI)1099-1557(200001/02)9:1<37::AID-PDS4

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

37-41

issue

1

eissn

1053-8569

issn

1099-1557

journal_volume

9

pub_type

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