| Model variable | Input | Source/Calculation |
---|---|---|---|
A | Total number of ICU admissions annually in the US | 4.4 mil | VERICC [18] |
B | % Adult ICU admissions | 0.8 | Groeger 1993 [19] |
C | % At risk for a late TF | 0.29 | Corwin 2002 [16] |
D | Mean # units/pt at risk – current practice | 3.01 | Corwin 2002 [16] |
E | Mean # units/pt TF – restrictive strategy group | 2.6 | Corwin 2002 [16] |
F | Number of patients in restrictive group | 418 | Hebert [15] |
G | % Patients transfused in restrictive group | 0.67 | Hebert [15] |
H | Mean # units/pt at risk – restrictive practice | 1.74 | (fxgxe)/f |
I | Total annual number of units TF – current practice | 3,073,360 | Axbxcxd |
j | Total annual number of units TF – restrictive practice | 1,778,234 | Axbxcxh |
k | Total annual number of units TF avoided restrictive practice | 1,295,126 | i-j |
l | CV+ARDS SACs in liberal group | 136 | Hebert 1999 [15] |
m | CV+ARDS SACs in restrictive group | 87 | Hebert 1999 [15] |
n | TSACs | 49 | l-m |
o | Total pRBC u TF liberal | 2,352 | Hebert 1999 [15]¶ |
p | Total pRBC u TF restrictive | 728 | Hebert 1999 [15]¶ |
q | pRBC u TF excess | 1,624 | o-p |
r | Units/1 TSAC | 33 | q/n |
s | TSACs avoided restrictive practice | 39,246 | k/r |