(5) As the data we extracted were baseline indicators for patients on the first day of icu admission, there was no way to obtain information on patients' use of diuretics, which are often a common cause of hyponatraemia, and due to the limitations of the MIMICIII database plasma B-type natriuretic peptide (BNP) or N-terminal pro-BNP levels had too many missing values, so they were not taken into account in our study. This evidence concerns the gene NPPB and Hyponatremia.