Table 2.

Sources and definitions of the auto-populated e-lndex and the physician-edited p-lndex.

Variable	Auto-populated e-lndex		Physician-edited p-lndex
	Source	Definition	Source
Demographics (age and sex)	Electronic health record (EHR)	Age in years; sex: male or female	Emergency physician note during emergency department (ED) visit
Comorbidities		ICD-9 codes
Cancer (active or history of)	Problem list in the EHR at the time of the index ED visit	140–172; 174–175; 179–209; V10.0–V10.82, V10.84–V10.91	Emergency physician and hospitalist notes during ED visit
Heart Failure (systolic or diastolic)	Problem list in the EHR at the time of the index ED visit	402.01, 402.11, 402.91; 404.01, 404.03, 404.11, 404.13, 404.91, 404.93; 425.1, 425.11, 425.18; 425.4, 425.5, 425.7–425.9; 428	Emergency physician and hospitalist notes during ED visit
Chronic Lung Disease (includes asthma)	Problem list in the EHR at the time of the index ED visit	491.0, 491.1, 491.20–491.22, 491.8, 491.9; 492.0, 492.8; 493.00–493.02, 493.10–493.12, 493.20–493.22, 493.81, 493.82, 493.90–493.92; 494.0, 494.1; 495–496; 500–505; 506.4; 515; 516.0– 516.2, 516.30–516.32, 516.34–516.37, 516.4, 516.5, 516.8, 516; 517.2; 518.1–518.3; 518.6; 518.83; 518.84	Emergency physician and hospitalist notes during ED visit
Vital Signs	EHR	The highest pulse and respiratory rate and the lowest systolic blood pressure, temperature, and oxygen saturation during the ED stay	Expanded to include unstructured vital signs documented in emergency physician or hospitalist notes during ED visita
Mental status	Nursing EHR flowsheet documentation	(1) Level of consciousness; (2) Orientation; (3) Mentation element of the Schmid fall-risk assessment; (4) Altered mental status	Emergency physician, nursing, and hospitalist notes during ED visit

a. Abstractors did not reference the original pre-hospital emergency medical care documentation or the pre-ED clinic notes.