Model name

Model description

Parameter Description

Parameter method

Weibull distribution model

F(t) is density function, s(t) is survival number; λ , β is control curve shape parameters; t is analysis time

Semiparametric method

Weibull distribution model

h 0 t is Benchmark risk function; β n is overall regression coefficient

Nonparametric method

Kaplan-Meier model

P is estimated survival rate for each time; n is total number of individuals observed; d is number of deaths