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Table 1 Predictor variables and outcomes in 135,470 adult emergency department visits

From: Emergency department triage prediction of clinical outcomes using machine learning models

Variable n = 135,470
Age (year), median (IQR) 46 (29–60)
Female sex 58,450 (43.1)
Mode of arrival
 Ambulance 26,820 (19.8)
Emergency Severity Index   
 1 (immediate) 2628 (1.9)
 2 (emergent) 16,908 (12.5)
 3 (urgent) 65,917 (48.7)
 4 (semi-urgent) 41,007 (30.3)
 5 (non-urgent) 9010 (6.7)
Vital signs
 Temperature (F), median (IQR) 98.1 (97.6–98.5)
 Pulse rate (bpm), median (IQR) 85 (74–97)
 Systolic blood pressure (mmHg), standard deviation (SD) 136 (23.2)
 Diastolic blood pressure (mmHg), standard deviation (SD) 79 (14.5)
 Respiratory rate (per min), median (IQR) 18 (16–20)
 Oxygen saturation (%), median (IQR) 98 (97–99)
Common chief complaints
 Musculoskeletal-related complaints 21,499 (15.9)
 Gastrointestinal-related complaints 20,947 (15.5)
 General complaints (e.g., fever) 20,581 (15.2)
 Injuries 16,731 (12.4)
 Respiratory-related complaints 13,539 (10.0)
 Neurological-related complaints 9828 (7.3)
 Urological-related complaints 6869 (5.1)
 Psychiatry-related complaints 4379 (3.2)
 Treatment-related complaints (e.g., side effects) 3368 (2.5)
 Eye and ear-related complaints 2952 (2.2)
 Skin-related complaints 2902 (2.1)
 Intoxication 1980 (1.5)
 Elixhauser comorbidity measures (≥ 1) 18,249 (13.5)
Clinical outcomes
 Critical care outcome* 2782 (2.1)
 Hospitalization outcome† 22,010 (16.2)
  1. Data are presented as number (percentage) of visits unless otherwise indicated
  2. Abbreviations: ED emergency department, IQR interquartile range, SD standard deviation
  3. *Direct admission to intensive care unit (ICU) or in-hospital death
  4. † Admission to an inpatient care site or direct transfer to an acute care hospital