Survival Analysis of Heart Failure Patients Using the Cox Proportional Hazard Model and Weibull Regression

Cardiovascular disesase is the leading cause of death globally, claiming around 17,9 million lives each year, accounting for 31% of all deaths worldwide. Hearth failure is a common event caused by cardiovascular disease. Hearth failure is one of the major health problems with high mortality and morbidity rates. Heart failure is the leading cause of mortality worldwide. This study aims to analyze the factors influencing the survival of heart failure patients using the Cox proportional hazard (Cox PH) model and the Weibull regression. The data used are secondary data from Kaggle consisting of 299 patients with the variables anemia, diabetes, hypertension, gender and smoking status. The analysis showed that only hypertension significantly increased the risk of events in both models, whereas other variables were not statistically significant. The selection of the best model is based on the assumptions of proportional hazard, flexibility, and Akaike information criterion (AIC) values. The Cox-PH model was chosen as the model of choice because it is more flexible and does not require certain fundamental assumptions regarding risk distribution. This study provides important insight into the risk factors that influence the prognosis of heart failure patients.