Table 3. Comparison of serious fall-related injuries between compliant flooring INT and control flooring CON groups in the FLIP Study, 2013–2017.

	Compliant Flooring		Control Flooring		Base Modela		Multivariable Modelb
	INT		CON
	(n = 184)		(n = 173)
Serious Fall-Related Injury	Events	Risk	Events	Risk	OR (95% CI)	p	OR (95% CI)	p
≥1 serious fall-related injury	23	12.5	23	13.3	0.98 (0.52, 1.84)	0.950	0.99 (0.52, 1.92)	0.977
≥2 serious fall-related injuries	10	5.4	13	7.5	0.74 (0.31, 1.75)	0.500	0.78 (0.31, 1.95)	0.594
	Events	Rate	Events	Rate	RR (95% CI)	p	RR (95% CI)	p
Number of serious fall-related injuries/1,000 bed nights	38	0.362	46	0.422	1.04 (0.45, 2.39)	0.925	1.23 (0.55, 2.76)	0.603
Number of serious fall-related injuries/fall	38	0.038	46	0.053	0.81 (0.38, 1.71)	0.560	0.90 (0.42, 1.92)	0.769
Number of falls with ≥1 serious fall-related injury/1,000 bed nights	29	0.276	33	0.303	0.97 (0.52, 1.79)	0.920	1.02 (0.55,1.88)	0.955
	Events	Rate	Events	Rate	HR (95% CI)	p	HR (95% CI)	p
Time to first serious fall-related injuryc	23	0.237	24	0.257	0.92 (0.52,1.62)	0.760	0.91 (0.50, 1.64)	0.727

^aIncludes main effect term for intervention group (1 = INT, 0 = CON). For binary logistic models that generated ORs, bed nights of follow-up was a covariate. For negative binomial models that generated RRs, offset was specified as bed nights of follow-up for endpoint of number of serious fall-related injuries/1,000 bed nights, and offset was specified as number of falls for endpoint of number of serious fall-related injuries/fall.

^bBase model plus adjustment for baseline values for the following five covariates: age (<85, 85+ years), dementia, ≥1 fall in the past 180 days, antianxiety medication, and analgesic medication.

^cRate expressed as events per 1,000 bed nights.

Abbreviations: CON, control; FLIP, Flooring for Injury Prevention; HR, hazard ratio; INT, intervention; OR, odds ratio; RR, rate ratio.