Table 1 Patient, surgical, and TVI characteristics that define the study population

Total Profiles

5296

Total Patients

4358

% Profiles representing repeat surgery

17.7

% ASA Physical Status 1

4.5

% ASA Physical Status 2

28.9

% ASA Physical Status 3

48.1

% ASA Physical Status 4

17.6

% ASA Physical Status 5

0.8

% Emergent Cases

10.4

Mean Age (SD)

53.6 (16.8)

% Male Gender

53.8

Most common surgical specialty (%)

1. General (12.8)

2. Orthopedic (8.9)

3. Thoracic (5.2)

Most common primary procedure (%)

1. Irrigation and Debridement of Wound (10.3)

2. Exploratory Laparotomy (5.1)

3. Anterior Spine Cervical Discectomy and Internal Fusion/Fixation (2.5)

Median Length of Procedure, hr. (Q1-Q3)

1.8 (1.0–3.4)

Total MAP measurements

333,179

Mean MAP, mmHg (SD)

81.4 (17.2)

Total BIS measurements

168,007

Mean BIS (SD)

41.3 (10.4)

Total MAC measurements

199,311

Mean MAC (SD)

0.81 (0.29)

Median frequency of MAP measurement, min (Q1-Q3)

3 (2–5)

Median frequency of BIS measurement, min (Q1-Q3)

5 (5–5)

Median frequency of MAC measurement, min (Q1-Q3)

5 (5–5)

Total TVI values

54,574

Mean TVI (SD) [min,max]

−0.09 (1.4) [− 8.1,7.5]

Median TVI values per profile (Q1-Q3) [min,max]

9 (5–13) [1,63]

Median proportion of missing TVI values due to CPB (Q1-Q3)

0.33 (0.24–0.40)

Median length of profile window, min (Q1-Q3)

10 (8–20)