However, unlike true randomization, propensity matching cannot eliminate confounding secondary to imbalance of unknown or unmeasured confounders, and this remains a major limitation of this study.
The maternal age variable is retained despite its use as a matching factor, in case the matching is too coarse to fully eliminate confounding.
Possibly, the stronger association between DES and breast cancer mortality observed in the Dieckmann study reflects the higher doses of DES administered to women in that cohort and/or the clinical trial design, which should eliminate confounding.
Dr Wilson and Dr Storm restricted their study to white, Protestant teenagers, in order to eliminate confounding variables.
The task design attempts to eliminate confounding of the deficits in dealing with novel material, a problem documented in PD, by concentrating on WM tasks of mental calculation that are familiar to subjects in daily living.
Multivariate survival analysis according to the Cox model was performed to eliminate confounding variables.
The capability to reduce or eliminate confounding is a major aim of ADR detection.
If the WHI variables are adequate to eliminate confounding, the adjusted HRs should be near 1.00.
To eliminate confounding, the SHOCK data were re-evaluated comparing IABP plus fibrinolysis with fibrinolysis alone.
These conditions together, which provide temporal order and eliminate confounding of other factors, justify causal claims between QTL and phenotypes.
