Table 1

How baseline characteristics were measured
Characteristic Data source
Demographic characteristics
Age Membership file
Gender Membership file
Race Membership file and electronic medical record (EMR)
BMI EMR (BMI; weight in kg/height in m2)
Smoking Status EMR
Clinical characteristics
Hypertension ICD-9 codes 401.xx – 405.xx, or systolic >140 or diastolic >90
Hyperlipidemia ICD 9 code 272.x, or total cholesterol >199mg/dL, or low density lipoprotein >129mg/dL
Ischemic stroke ICD 9 codes: 433.xx, 434.xx, 436, 438.0-438.53, 438.8-438.82, 438.89, 438.9, 997.02
Transient ischemic attack ICD 9 codes: 435.xx
Hypothyroidism ICD 9 codes: 243, 244.xx
Chronic lung disease ICD 9 codes: 490, 491–491.21, 491.8, 491.9, 492.xx, 493.0x, 493.1x, 493.2x, 493.9x, 494.x, 495, 495.0, 495.2-495.9, 496, 518.1, 518.2
Aortic/mitral valvular disease ICD 9 codes: 395.xx, 424.0, 424.1, 746.3-746.6, 746.81, 394.xx, 396.xx
Depression ICD 9 codes: 296.2x-296.6x, 296.7, 296.8, 296.80, 296.82, 296.89, 300.4, 301.12, 309.1, 311
Atrial fibrillation or flutter ICD 9 codes: 427.3x
Diabetes Health plan diabetes registry
Coronary artery disease/acute myocardial infarction ICD 9 codes: 410.xx – 414.xx, excluding 414.10, 414.11, 414.19
Peripheral vascular disease ICD 9 codes: 250.7x, 440.xx, 443.81, 443.9
Left ventricular wall thickness echocardiogram
Ejection fraction echocardiogram
Laboratory characteristics
Renal function Outpatient laboratory values for serum creatinine (glomerular filtration rate estimated from MDRD equation)

BMI (Body mass index), EMR (electronic medical record), ICD-9 (International Classification of Diseases, 9th revision, clinical modification), MDRD (4-variable Modification of Diet in Renal Disease equation).

Smith et al.

Smith et al. BMC Health Services Research 2012 12:434   doi:10.1186/1472-6963-12-434

Open Data