“…Four cardiovascular conditions (congestive heart failure, arrhythmia, cardiac valvular disorders and pulmonary circulation disorders) and coagulopathy were excluded from this algorithm and analysed separately; the remaining comorbidities were categorized as 0, 1, 2 and ≥3. As liver disease severity is an important predictor of post‐operative mortality and laboratory data are not available in the NIS for calculation of the CP or model for end‐stage liver disease (MELD) scores (12, 20), we also controlled for features of hepatic decompensation using ICD‐9‐CM diagnosis codes as described previously (21, 22). There is no standard definition for coagulopathy in the ICD‐9‐CM coding system, thus making this an arbitrary distinction.…”