Incidence and predictors of virological failure among adult HIV patients on first-line antiretroviral therapy in Amhara regional referral hospitals; Ethiopia: a retrospective follow-up study

Table 4 Summary of model comparison among the Cox proportional hazard model, parametric Cox- Regression models and frailty models using AIC, BIC LR criteria

Model	Baseline Hazard	Frailty	Variance	AIC	BIC	Log-likelihood
Cox regression	Unspecific			622.50	706.38	− 291.25
Weibull regression	Weibull			313.15	405.43	− 134.57
Univariate frailty	Weibull	Gamma	1.4e⁻⁰⁷(p = 1.00)	315.16	411.42	− 131.23
Univariate frailty	Weibull	Inv_Gaussian	2.81e⁻⁰⁷(p = 1.00)	315.16	411.62	−134.57
Shared frailty (Hospital)	Weibull	Gamma	8.42e⁻⁰⁷(p = 1.00)	315.16	411.62	.131.23
Exponential	Exponential			372.74	460.82	− 165.37
Gompertz	Gompertz			322.04	426.27	− 139.02
Loglogistic regression	Log logistic			318.81	411.09	− 137.40
Lognormal regression	Log normal			325.21	417.48	− 140.60

ISSN: 1471-2334