Improving hospital quality risk-adjustment models using interactions identified by hierarchical group lasso regularisation.

3 ). For PSI 14, the main effect of the non-open approach, relative to the open approach, was highly significant with adjusted odds ratios of 0.039 (95% confidence interval [CI], 0.028-0.055) in the non-interaction model and 0.047 (95% CI, 0.027-0.078) in the interaction model.

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