Time step

Feature

Values

C-statistic for 30-day mortality

Cumulative C-statistic for 30-day mortality

C-statistic for 90-day mortality

Cumulative C-statistic for 90-day mortality

1. Procedure Scheduled

Gender

{Female, Male}

0.56

-

0.56

 -

Race

{White, Black, Hispanic, Other}

0.58

 -

0.49

-

Age

numeric

0.58

-

0.60

-

BMI

6 groups

0.46

0.55

Charlson Comorbidity Index

Discrete values from 0 - 20, inclusive

0.69

 0.69

 Best step 1 features

Race + CCI

0.70

Gender + CCI

0.71 

2. Morning of surgery

Start location

{Home, Ward, ICU, EC}

0.61

0.61

Emergency status

{Absent, Present}

0.58

0.57

ASA classification

Numeric:

{1,2,3,4,5}

0.65

0.62

Best step 1 & all step 2 features

0.76 

0.78 

3. Procedures complete

Adrenalectomy

{Absent, Present}

0.49

Excluded 

0.49

Excluded

Colectomy

{Absent, Present}

0.48

Excluded

0.52

Cystectomy

{Absent, Present}

0.54

0.53

Enterectomy

{Absent, Present}

0.57

0.55

Enteroenterostomy

{Absent, Present}

0.51

0.52

Enterostomy

{Absent, Present}

0.53

0.53

Gastrectomy

{Absent, Present}

0.50

Excluded

0.49

Excluded 

Hepatectomy

{Absent, Present}

0.48

Excluded 

0.52

Hysterectomy

{Absent, Present}

0.57

0.57

Jejunostomy

{Absent, Present}

0.51

0.51

Nephrectomy

{Absent, Present}

0.48

 Excluded

0.51

Oophorectomy

{Absent, Present} 

0.50

Excluded

0.51

Pancreatectomy

{Absent, Present}

0.52

0.51

Pelvic exenteration

{Absent, Present}

0.51

0.51

Splenectomy

{Absent, Present}

0.50

Excluded

0.50

Excluded

Best step 1, all step 2, & discriminative step 3 features

0.79 

 0.78

4. Anesthesia complete

Surgical Apgar score

{≤5, 6, 7, 8, 9, 10}

0.76

0.84

0.70

0.82

5. Post PACU

Extended PACU

{Absent, Present}

0.52

Excluded

0.52

Excluded

Surgical destination

{Discharge, Ward, ICU, Surgery}

0.72

0.86

0.63

0.82

6. Six days post-operative

Delayed ICU admit

{Home, Home Care, Institutional Care, PACU, Hospital Ward, ICU}

0.56

0.87

0.53

0.84