| http://www.w3.org/ns/prov#value | - This variable was significant and positively associated with screening (adjusted OR=1.10, 95 percent CI=1.03???1.19), suggesting a combined and positive influence on mammography use when both plan features are present.Selection BiasAn important concern for this study was selection bias, that is, whether certain types of patients choose health plans with certain features, thereby potentially biasin
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