Grouping of risk factors (excluding non-significant words).

Grouping of risk factors (excluding non-significant words).</p

Demographic characteristics of the patients and nurse records.

Demographic characteristics of the patients and nurse records.</p

Graphs showing the construction of the machine learning model.

LR, logistic regression model; SVC, support vector classifier; DT, decision tree; RF, random forest.</p

Graphs showing the sensitivity, specificity, and odds ratio for predicting disease onset using risk factors.

The vertical axis represents the percentage of patients, and the horizontal axis represents 7 days before and after the day of delirium onset (day 0). The blue dotted line indicates the percentage of patients with delirium 1–7 days before its onset. The red dotted line indicates the frequency observed in patients without delirium.</p

Flow diagram for the records included in this study.

Flow diagram for the records included in this study.</p

Fifty 1-gram words with high features were extracted from the machine-learning model.

Fifty 1-gram words with high features were extracted from the machine-learning model.</p