The remaining 3.6 million births from 1978 through 2002 in New York State (excluding New York City) were assigned to the comparison population
. Because of the small number of births in the study area, there were very few exposed cases of some of the rarer outcomes.
The purpose of the comparison population
in the PGP demonstration is to provide a benchmark for the cost control performance of the participating PGP.
Other participating practices achieved lower Medicare spending growth rates than comparison populations
in their local markets, but their savings did not meet the 2% threshold to share in the Medicare savings, possibly because not all practices were able to fully deploy their initiatives in the first year, Mr.
The rate of re-incarceration was computed in each service program for the first 12 months upon release to parole (for which the statewide non-PPCP population was used within the same period for comparison), and the rates of re-incarceration and absconding for the 12 months upon admission to treatment programs (for which there was no equivalent statewide comparison population
Without a comparison population
, the investigators cannot even claim that the drug works differently in African Americans.
(3) Contrary to the expectation that nonoxynol-9 products might reduce HIV transmission, one study demonstrated that HIV incidence was greater in a high-risk population using nonoxynol-9 than in a comparison population
using a placebo.
As part of its genetic studies of Japanese survivors of atomic blasts and people living near sites of atomic bomb testing, the AEC wanted to use the Yanomami as a comparison population
with no history of radiation exposure, Tierney says.