Table 4.

Final multivariable model for patient and surrogate characteristics associated with enrollment into sham trial

Characteristic	OR (95% CI)	P Value
Patient previously enrolled in research	1.76 (0.57–5.37)	0.32
Surrogate previously enrolled in research	1.21 (0.34–4.35)	0.77
CRS	0.57 (0.45–0.71)	<0.001
Surrogate perception of patient trajectory as improving	0.89 (0.31–2.58)	0.83
Surrogate white race	3.69 (1.11–12.21)	0.03
APACHE IV score	1.01 (0.99–1.03)	0.11

Definition of abbreviations: APACHE = Acute Physiology and Chronic Health Evaluation; CI = confidence interval; CRS = comparative riskiness scale; OR = odds ratio.

Analytic sample included patients with complete data (n = 105).