Table 2. Adjusted ordinal logistic regression models predicting post-arrest injury severity, modeled as Pittsburgh Post-Cardiac Arrest Category.

Predictor	Adjusted OR (95%CI)	P value
Model 1:
Antiplatelet use	0.55 (0.40 – 0.77)	<0.001
Anticoagulant use	0.80 (0.51 – 1.25)	0.33
Age	1.00 (0.99 – 1.01)	0.60
Shockable rhythm	0.33 (0.24 – 0.45)	<0.001
Witnessed arrest	0.64 (0.47 – 0.87)	0.01
Model 2:*
Antiplatelet use	0.50 (0.33 – 0.77)	0.002
Anticoagulant use	0.83 (0.46 – 1.47)	0.51
Age	1.00 (0.99 – 1.01)	0.74
Shockable rhythm	0.49 (0.31 – 0.76)	0.001
Witnessed arrest	0.65 (0.04 – 0.98)	0.04
Cardiac etiology of arrest	0.45 (0.29 – 0.71)	0.001

^*Because accurate arrest etiology data are only available after February 2012, model 2 includes only 466 of 1,054 subjects