is age a hazard variable? does cox proportional hazard regression always have to be time is age a hazard variable in cox regression? can cancer patient be a hazard variable can age be a hazard variable what is cox regression can age of patient be a hazard variable? is age a hazard variable is age a hazard variable in a cox hazard regression can age of cancer patient be a hazard variable? can age be a hazard variable are time and age considered hazard variables cox regression timescale is age a hazard variable what is the hazard variable when using cox can age be considered a hazard variable? is age a hazard variable can age be a hazard variable is age a hazard variable what is the hazard variable for cox regression