Classifying medical histories in US Medicare beneficiaries using fixed vs all-available look-back approaches.
Mitchell M ConoverTil StürmerCharles PooleRobert J GlynnRoss J SimpsonVirginia PateMichele Jonsson FunkPublished in: Pharmacoepidemiology and drug safety (2018)
The all-available look-back performed nearly as well as the 3-year fixed, which produced the least biased point estimate. If 3-year look-backs are infeasible (eg, due to power/sample), all-available look-backs may be preferable to short (1-year) fixed look-backs.
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