# Relationship between the sentiment of nursing notes and one-year mortality of elderly sepsis patients

## TL;DR

This study found that the sentiment in nursing notes is linked to the one-year survival of elderly sepsis patients.

## Contribution

It introduces sentiment analysis of nursing notes as a novel predictor for sepsis patient mortality.

## Key findings

- Lower sentiment polarity and higher subjectivity in nursing notes correlate with higher one-year mortality.
- Sentiment polarity has a linear relationship with mortality, while subjectivity shows a nonlinear pattern.
- Sentiment features are independently associated with one-year mortality in elderly sepsis patients.

## Abstract

This study aimed to explore the correlation between the sentiment of nursing notes and the one-year mortality of sepsis patients.

The box plot was used to compare the differences in sentiment polarity/sentiment subjectivity between different groups. Multivariate logistic regression was used to explore the correlation between sentiment polarity/sentiment subjectivity and one-year mortality of elderly sepsis patients. Ridge regression, XGBoost regression, and random forest were used to explore the importance of sentiment polarity and subjectivity in the one-year mortality of elderly sepsis patients. Restricted cubic spline (RCS) was used to explore whether there was a linear relationship between sentiment polarity, sentiment subjectivity and the one-year mortality of elderly sepsis patients. Kaplan-Meier (KM) curve was used to explore the relationship between the sentiment polarity (or sentiment subjectivity) and the 1-year death of the patient.

Compared with the control group, the one-year mortality group year had lower sentiment polarity and higher sentiment subjectivity. Sentiment polarity and sentiment subjectivity were independently related to the one-year mortality of elderly sepsis patients. There was a linear relationship between sentiment polarity and the one-year mortality of elderly sepsis patients. At the same time, there was a nonlinear relationship between sentiment subjectivity and the one-year mortality of elderly sepsis patients.KM.

The sentiment of nursing notes was correlated with the one-year mortality of elderly sepsis patients.