Table 1.

Comorbidity definitions for Form 2728 and CHOICE dataa

Form 2728 Comorbidity Definition (Check all that apply currently or during last 10 years)CHOICE Comorbidity Definition (Medical record documentation of a history of the condition, based on the listed criteria)b
aThe definitions listed here replicate the definitions used on Form 2728 and CHOICE data instruments.
bThe CHOICE data were derived from a medical record review for all conditions except “Tobacco use,” determined by patient questionnaire, and “Inability to ambulate,” ascertained by the dialysis unit nurse using the Index of Physical Impairment. Conditions were considered present if any of the listed criteria were documented in the medical record. CHF, congestive heart failure; CAD, coronary artery disease; MI, myocardial infarction; CABG, coronary artery bypass graft; EKG, electrocardiogram; CVA, cerebrovascular accident; TIA, transient ischemic attack; PVD, peripheral vascular disease; COPD, chronic obstructive pulmonary disease.
a. Congestive heart failure• Diagnosis of any CHF or history of pulmonary edema
b. Ischemic heart disease, CAD: includes prior CABG, angioplasty, and diagnoses of CAD/coronary heart disease.• Diagnosis of CAD, or
• Any history of MI, or
• Prior CABG or coronary angioplasty, or
• MI in the past 3 mo
• (Although CHOICE obtains information regarding stable angina, exertional angina, rest angina, ischemia on EKG or other diagnostic test, and EKG evidence of old MI, we did not include these criteria in the definition for CAD.)
c. Myocardial infarction• Any history of myocardial infarction, or
• Myocardial infarction in the past 3 mo
d. Cardiac arrest• Cardiac arrest in the past year
e. Cardiac dysrhythmia• Arrhythmia or conduction problem (on EKG or in notes), or
• Arrhythmias or conduction problem requiring medication or temporary pacemaker, or
• Recurrent syncope (due to arrhythmia or conduction problem) while on medication, or
• Requirement of a permanent pacemaker or defibrillator
f. Pericarditis• Pericarditis in the past year
g. Cerebrovascular disease, CVA, TIA: includes history of stroke/CVA, and TIA• Diagnosis of cerebrovascular disease, or
• Multiple TIAs in past year, or
• History of CVA with no or mild deficit (e.g., hemiparesis, slurred speech, mild cognitive changes), or
• CVA with major deficit (e.g., paralysis, aphasia, blindness)
h. Peripheral vascular disease: includes absent foot pulses, prior typical claudication, amputations for vascular disease, gangrene, and aortic aneurysm.• Diagnosis of PVD, or
• Intermittent claudication, or
• Amputation of toes or foot, or
• Prior bypass graft, abdominal or thoracic aortic aneurysm repair, or
• Pain at rest due to PVD, or
• Inoperable disease, or
• Amputation below or above the knee, or
• Abdominal aortic aneurysm
i. History of hypertension• Diagnosis of hypertension, or
• Requirement of antihypertensive medication, or
• Episode of malignant or accelerated hypertension in past 3 mo
j. Diabetes mellitus (primary or contributing)• Diagnosis of diabetes mellitus (type I or II), or
• Requirement of oral medication, or
• Requirement of insulin, or
• Uncontrolled diabetes: four or more hypoglycemic episodes or two or more hospitalizations for hyperglycemia or ketoacidosis
k. Diabetes mellitus, currently on insulin• Insulin requirement
l. Chronic obstructive pulmonary disease• Diagnosis of COPD (e.g., chronic bronchitis, asthma, emphysema, or pulmonary fibrosis), or
• Asthma or COPD requiring medications
m. Tobacco use (current smoker)• Patient questionnaire: Do you currently smoke cigarettes?
n. Malignancy neoplasm• Diagnosis of malignancy, >5 yr since last treatment, or
• Diagnosis of malignancy, <5 yr since treatment, but none in past year, or
• Current malignancy or treatment within last year (Skin cancer other than melanoma was excluded)
o. Alcohol dependence• No corresponding data
p. TDrug dependence• No corresponding data
q. HIV-positive status• Diagnosis of HIV (HIV-positive)
r. AIDS• Diagnosis of AIDS
s. Inability to ambulate• Index of physical impairment: Confined to wheelchair, bedridden (Does not include: “walks with assistance, uses cane or walker”)
t. Inability to transfer• No corresponding data