is age a significant predictor of mortality in cox? what is the role of age in a risk analysis of infectious diseases is age a significant predictor of mortality? does age affect mortality coxph effect coxph proportional hazards survival analysis __________ is a statistically significant cofactor in a coxph analysis. what are the characteristics of a proportional hazards analysis? which covariate is used in the coxph analysis? what is the coxph of mortality r. what are the covariates of a coxph analysis what is the significance of each covariate if they are not found in a large data set which of the covariates is a significant risk limiting coxph analysis ________ is the principal covariate for which mortality data is extracted which type of fish has the greatest risk of mortality because of the virus type? r. how the two covariates contribute to the proportional survival of mortality do covariates interact what is the significant relationship between the two covariate in the coxph analysis what is the coxph analysis what is the significance of the coxph model for determining hazard