Effect on secondary care of providing enhanced support to residential and nursing home residents: a subgroup analysis of a retrospective matched cohort study.

In particular, the subgroup analysis by care home type was specified a priori and was the only subgroup specified; care home type was determined at baseline; the comparison was made within, rather than between, studies; the interaction test was highly significant, suggesting a low likelihood that chance alone explained the apparent difference between residential and nursing homes; and the effect was consistent across several closely related outcomes relating to emergency hospital use.

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