Acta Informatica Pragensia 2022, 11(1), 36-47 | DOI: 10.18267/j.aip.1632937

Predicting Mortality in Patients with Stroke Using Data Mining Techniques

Zahra Hadianfard1, Hadi Lotfnezhad Afshar ORCID...1, Surena Nazarbaghi ORCID...2, Bahlol Rahimi ORCID...1, Toomas Timpka ORCID...3
1 Department of Health Information Technology, School of Allied Medical Sciences, Urmia University of Medical Sciences, Urmia, Iran
2 Department of Neurology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
3 Department of Health, Medicine, and Caring Sciences, Linköping University, Linköping, Sweden

The mortality due to stroke is increasing. Accurate prediction of stroke-caused death is very important for healthcare. Data mining methods are novel ways to predict these mortality risks. The aim of this study is to employ popular data mining algorithms to predict the survival of stroke patients and extract decision rules. The data on stroke patients (n=4149) were collected from paper medical records. Missing data were managed using the multiple imputation method. Also, the target variable was balanced using methods such as over-sampling, under-sampling and Synthetic Minority Oversampling (SMOTE). The support vector machine (SVM), decision tree, and logistic regression (LR) algorithms were employed to predict the survival of stroke patients. Also, the Repeated Incremental Pruning to Produce Error Reduction (RIPPER) algorithm was used to extract the decision rules from the main dataset. LR outperformed other algorithms in terms of accuracy (76.96%), sensitivity (79.06%) and kappa (33.34). However, specificity (65.35%) and AUC (0.77) scores were lower than those of other algorithms. An independent dataset with 234 records was selected to challenge the LR algorithm with the best performance from the main dataset. After employing this algorithm on the external validation dataset, its performance was improved in accuracy (79.91%), sensitivity (83.94%), kappa (39.26) and AUC (0.8), but not in specificity (60.98%). The constructed model predicted the survival of stroke patients with high scores and useful rules were extracted for clinical usage.

Keywords: Data mining; Decision trees; Stroke; Survival; Logistic regression; Iran.

Received: September 20, 2021; Revised: November 17, 2021; Accepted: November 18, 2021; Prepublished online: November 21, 2021; Published: March 13, 2022  Show citation

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Hadianfard, Z., Lotfnezhad Afshar, H., Nazarbaghi, S., Rahimi, B., & Timpka, T. (2022). Predicting Mortality in Patients with Stroke Using Data Mining Techniques. Acta Informatica Pragensia, 11(1), 36-47. doi: 10.18267/j.aip.163
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