Costs of fall injuries in the STRIDE study: an economic evaluation of healthcare system heterogeneity and heterogeneity of treatment effect

Table 5 Results of omnibus Wald tests from Tweedie models testing for mediation*

Covariates	Mediator
	Model 1: Fall risk p value	Model 2: Treatment-seeking p value	Model 3: Treatment intensity p value
Treatment arm (intervention vs. control)	0.337	0.366	0.409
Healthcare system – direct effect	0.010	0.005	0.237
Healthcare system – indirect (mediated) effect	0.283	0.431	0.057

*In addition to covariates shown, models control for constrained randomization variables: (a) practice size (by tertile), (b) geography (urban versus rural), and (c) practice race/ethnicity (majority of patients’ primary identification: nonwhite versus white)

ISSN: 1478-7547