Table 1.

Clinical prediction model covariates for HF readmission

	Felker [45]	Krumholz [46]	Amarasingham [13]	Van Walraven [51]
Demographic characteristics
Age	x		x
Sex			x
Marital status			x
Low SES			x
# Home address changes			x
Medicare			x
Cardiovascular status
NYHA class	x
Prior HF		x		x
Prior MI				x
Health services use history
Prior admission/ED visit		x	x	x
Prior missed clinic visit			x
Pharmacy use			x
Acute presentation features
Daytime ED presentation			x
Acute admission				x
Length of stay				x
Vital signs
Systolic BP	x		x
Diastolic BP			x
Heart rate			x
Temperature			x
Laboratory tests
Serum sodium	x		x
Blood urea nitrogen	x		x
Creatinine		x	x
WBC count			x
Albumin			x
CK			x
Troponin			x
INR			x
Bilirubin			x
Arterial pH			x
Arterial pCO2			x
Comorbid conditions
Diabetes		x		x
COPD			x	x
Cancer			x	x
Peripheral vascular disease				x
Cerebrovascular disease				x
Liver disease				x
Connective tissue disease				x
HIV infection				x
Mental health
Depression/anxiety			x
Altered mental status			x
Cocaine abuse			x
Dementia				x

SES socioeconomic status; NYHA New York Heart Association; HF heart failure; MI myocardial infarction; ED emergency department; BP blood pressure; WBC white blood count; CK creatine kinase; COPD chronic obstructive pulmonary disease