Increasing the uptake of vitamin D supplement use in Australian residential aged care facilities: results from the vitamin D implementation (ViDAus) study

Table 6 Rate of falls (number of falls per 1000 occupied bed days) at each facility

	Overall	Wedge 1	Wedge 2	Wedge 1 vs. Wedge 2
	Mean (Range)	Mean (Range)	Mean (Range)	Unadjusted p value for raw difference^a	Adjusted for baseline^a
Audit 1: 6 months pre-baseline	5.6 (2.1–12.5)	4.9	6.1	p = 0.092
Audit 2: Baseline to 6 months	6.4 (1.7–12.9)	5.4	7.1	p = 0.095	p = 0.4
Audit 3: 6 to 12 months	6.7 (1.7–12.9)	6.1	7.1	p = 0.3	p = 0.6
Audit 4: 12 to 18 months	7.0 (1.9–18.0)	5.8	7.7	p = 0.082	p = 0.7
Pre-intervention Period (Wedge 1: Audit 1; Wedge 2: Audits 1 + 2)	5.8 (2.1–12.7)	4.9 (2.7–9.2)	6.5 (2.1–12.7)
Post Intervention Period (Wedge 1: Audits 3 + 4; Wedge 2: Audit 4)	6.7 (2.2–14.6)	5.8 (2.3–10.0)	7.4 (2.2–14.6)
	Mean Change (signed rank test p value)			Kruskal-Wallis p value for difference between wedges
Change Post Intervention vs. Pre-Intervention	0.9 (p = 0.015)	0.8 (p = 0.14)	0.9 (p = 0.05)	p = ~ 1

^aNegative binomial model used for fall rates per occupied bed days due to overdispersion in the Poisson model. Adjustment for baseline was achieved using a longitudinal GEE model with autoregressive correlation

ISSN: 1471-2318