Estimation using all available covariate information versus a fixed look-back window for dichotomous covariates.
Estimation using all available covariate information versus a fixed look-back window for dichotomous covariates.
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DOI:
10.1002/pds.3434
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发表时间:
2013-05
影响因子:
2.6
通讯作者:
Seeger, John D.
中科院分区:
文献类型:
--
作者:
Brunelli, Steven M.;Gagne, Joshua J.;Huybrechts, Krista F.;Wang, Shirley V.;Patrick, Amanda R.;Rothman, Kenneth J.;Seeger, John D.
When using claims data, dichotomous covariates (C) are often assumed to be absent unless a claim for the condition is observed. When available historical data differs among subjects, investigators must chose between using all available historical data versus data from a fixed window to assess C. Our purpose was to compare estimation under these two approaches. We simulated cohorts of 20000 subjects with dichotomous variables representing exposure (E), outcome (D) and a single time-invariant C, as well as varying availability of historical data. C was operationally defined under each paradigm and used to estimate the adjusted risk ratio of E on D via Mantel-Haenszel methods. In the base case scenario, less bias and lower MSE were observed using all available information compared with a fixed window; differences were magnified at higher modeled confounder strength. Upon introduction of an unmeasured covariate (F), the all-available approach remained less biased in most circumstances and better approximated estimation that was adjusted for the actual (modeled) value of the confounder in all instances. In most instances considered, operationally defining time-invariant dichotomous C based on all available historical data, rather than on data observed over a commonly shared fixed historical window, results in less biased estimates.
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