Table 1.

Parameter estimates from the application of mixture model methods to HIV data

	Mixture* Probability		Lognormal Therapy Initiation		Generalized Gamma AIDS/ Death
Parameter	Estimate	Standard Error***	Estimate	Standard Error***	Estimate	Standard Error***
Location
Intercept	1.0754	0.1572	−0.0368	0.0692	0.1647	0.1747
History of IDU* (Yes vs. No)	−0.8976	0.1445	0.0439	0.0710	0.0722	0.1568
African-American (Yes vs. No)	−0.3222	0.1408	0.3207	0.0619	0.1454	0.1541
CD4 Nadir**	0.0432	0.0298	0.1848	0.0144	0.1510	0.0300
Age**	−0.0070	0.0088	−0.0108	0.0036	−0.0069	0.0105
Scale			0.7871	0.0269	1.1176	0.0816
Shape					0.8487	0.1476

^*Mixture Probablity ${\Pi }_i=\frac{{\mathrm{e}}^{\Sigma \text{Parameter Estimate}}}{1+{\mathrm{e}}^{\Sigma \text{Parameter Estimate}}}$; IDU, injection drug use

^**CD4 (per 100 cells/mm³) centered at 349 cells/mm³; Age (per year) centered at 36 years

^***Wald-based standard errors which were not used in estimation of summary hazard ratio measures but are presented for completeness