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This study was retrospective, with the Prograf arm composed of historical controls; era effect could therefore potentially explain the greater number of events in the Prograf arm.
With the use of a historical control, one cannot exclude an era effect with observed difference in the two groups potentially explained by other changes to training practice during the two study periods rather than exposure to the innovation room.
The number of patients studied was relatively small, formal pharmacokinetic testing was not performed, and the cohorts were not truly contemporaneous although they were close enough to each other in the transplant date to avoid an era effect.
Crossover trials generally have a short follow-up time and can have a carryover effect; before/after studies are subject to an era effect bias, which is also a concern with many of the published cohort studies because of the use of historical controls.
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It did no good, but compared with the titanic monetary policy disasters of the era, the effect of Smoot-Hawley was probably very small, or so most mainstream economists believe.
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However, these impacts appear unrelated to ERA's effects on labour market outcomes.
Step 4. As described in Section 7.4.2 of Hendra et al. (2011), formulas were applied to the impacts estimates, especially the estimated impact on earnings, in order to determine some of the remaining benefits and costs listed in the table for example, ERA's effects on indirect taxes, National Insurance Contributions, and pensions.
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