. Author manuscript; available in PMC: 2021 Apr 1.

Published in final edited form as: Am J Emerg Med. 2019 Jun 10;38(4):746–753. doi: 10.1016/j.ajem.2019.06.019

Table 4.

Sensitivity analysis, including both patients with multiple ED visits during study and those without continuous health plan coverage through 90 days (n=34,225)

	Adjusted range	y-intercept (baseline)	Absolute quarterly change	Relative quarterly change	R²	P value
RBC transfusion in ED	12.5–18.2%	16.3%	−0.06%	−0.4%	0.05	0.008
RBC transfusion during index hospitalization	29.6–36.0%	36.1%	−0.3%	−0.8%	0.64	<0.0001

Results are presented using the best fit linear line to the graphed data, where the adjusted outcome rate = bx + y and b = absolute quarterly change (slope), x = quarter (time) and y = intercept (baseline). Relative quarterly changes are calculated by dividing the absolute quarterly change by the extrapolated baseline values (y-intercept).

Abbreviations – ED = emergency department; RBC = red blood cell