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Operating within the constraints of a relatively modest budget and an intervention that by its very nature could not be tested via a randomized controlled study, we conducted the cluster care evaluation, employing a quasi-experimental pretest-posttest design and statistical methods to control for nonequivalence between the intervention and comparison sites.
Our evaluation found that cluster care was associated with a 10 percent reduction in service hours and costs at the intervention sites.
The cluster care intervention has such compelling face validity for containing costs, reinforced by the findings of this empirical evaluation, that Medicaid policymakers are probably already working on diffusing cluster care to more sites in New York City and to other cities around the country.