Table 4.

Unadjusted and Adjusted Analysis of Surrogate-Reported Number of Treatments Rejected Across Health Scenarios

Covariate	Ratio of average counts of rejecting treatment across health scenarios
	Ratio	95% CI	P
Unadjusted model
Patient: MCI vs NC	1.20	0.79, 1.82	0.40
Adjusted model
Patient: MCI vs NC	1.06	0.71, 1.57	0.77
Surrogate: age, years	1.00	0.97, 1.02	0.69
Surrogate: Black vs White	0.52	0.30, 0.92	0.02
Surrogate: male vs female	0.92	0.59, 1.43	0.70
Surrogate: education
Some college vs no college	0.56	0.28, 1.13	0.11
4-year degree vs no college	1.08	0.51, 2.28	0.85
Graduate degree vs no college	0.79	0.41, 1.53	0.49
Surrogate: history vs no history of stroke	2.80	1.68, 4.68	<0.001

Unadjusted and adjusted models were tested using zero-inflated negative binomial regression. Abbreviations: CI, confidence interval; MCI, mild cognitive impairment; NC, normal cognition