Table VI.

Treatment effect on 2-year mortality rate using 311 subjects in the PBC data. For IPW, logistic regression with the main effects of the twelve covariates was used to fit the propensity model. For OPT, separate logistic regression models for the outcome were fitted to the two arms with the main effects of the twelve covariates.

Method	Estimate of the difference in mortality rates (%) (DPCA minus placebo)	Standard error (%)	p-value
UNADJ	−3.42	3.49	0.33
IPW	−4.62	2.75	0.09
OPT	−5.23	2.65	0.05