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

From: The triple variable index combines information generated over time from common monitoring variables to identify patients expressing distinct patterns of intraoperative physiology

Variable 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)
  1. The three most common surgical specialties and procedures associated with the population are shown. SD standard deviation, Q1 1st quartile, Q3 3rd quartile, hr. hour, Min minutes