Accelerated failure-time model with weighted least-squares estimation: application on survival of HIV positives

Table 5 Estimates from the Classical AFT and the Cox PH Models

Method	Covariates	Estimates	SE	95%CI
Method	Covariates	Estimates	SE	LCL	UCL
LN AFT	meanlog	4.832	0.1564	4.526	5.139
	sdlog	0.232	0.0286	0.182	0.295
	Age	−0.009	0.0029	− 0.015	−0.003
	Weight	0.008	0.0032	0.002	0.014
	CS (IV)	−0.278	0.0599	−0.395	− 0.160
Rank	Age	−0.009	0.0033	−0.015	−0.002
	Weight	0.008	0.0033	0.001	0.014
	CS (IV)	−0.277	0.0572	−0.389	− 0.165
LSE	Age	−0.009	0.0027	−0.014	−0.004
	Weight	0.008	0.0026	0.003	0.013
	CS (IV)	−0.272	0.0530	−0.376	− 0.168
Cox PH	Age	0.054	0.0177	0.019	0.089
	Weight	−0.047	0.0228	−0.092	− 0.002
	CS (IV)	1.917	0.3684	1.195	2.639

Estimates: Coefficients Correspond to the log Median Survival Time for the First Three and log Hazard for the Cox PH; Estimate for Age corresponds to a year increase in Age; Estimate for Weight corresponds to a Kilogram increase in Weight; SE: Standard Error; CI: Confidence Interval; LCL: Lower Confidence Limit; UCL: Upper Confidence Limit; LN AFT: Log-Normal Accelerated Failure-Time; CS: Clinical Stage; LSE: Least Square Estimation; PH: Proportional-Hazards; meanlog: Mean of Log Survival Time; sdlog: Standard Deviation of Log Survival Time.

ISSN: 2049-3258