Sampling strategies in nested case-control studies.

Abstract:

:A stratified version of nested case-control sampling which we call "countermatching" is presented. This design uses data available for all cohort members to obtain a sample for collecting additional information in a case-control substudy. Hitherto the only stratified sampling design for such studies has involved matching of controls to cases with respect to confounding variables. However, in some situations, rather than sampling to make controls as similar as possible to cases, we might wish to make them as different as possible. This is achieved by the counter-matched design. Statistical analysis of counter-matched studies is straightforward using existing computer software. We investigate the use of the design when a surrogate measure of exposure is available for the full cohort, but accurate exposure data is to be collected only in a nested case-control study, and when exposure data are available for the whole cohort but data concerning important confounders are not. Asymptotic relative efficiency calculations indicate that a substantial efficiency gain relative to simple random sampling of controls can be expected in these situations. We also illustrate how the design might be implemented in practice.

authors

Langholz B,Clayton D

doi

10.1289/ehp.94102s847

subject

Has Abstract

pub_date

1994-11-01 00:00:00

pages

47-51

eissn

0091-6765

issn

1552-9924

journal_volume

102 Suppl 8

pub_type

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