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Table 1 Baseline characteristics to predict ESRD (RRT) and how they were measured using Kaiser Permanente Northwest data during the baseline period (1997-1999)

From: Predicting the risk of end-stage renal disease in the population-based setting: a retrospective case-control study

Characteristic Data source
Demographic characteristics for matching
Age Membership file
Sex Membership file
CLINICAL CHARACTERISTICS  
Height and weight (body mass index) Height and weight recorded as separate fields in the medical record.
Current smoking Visit with ICD-9 code 305.1, or recorded as separate field in electronic medical record
Hypertension Visit with ICD-9 codes: 401.xx - 405.xx, or blood pressure values recorded as separate fields in the electronic medical record (systolic ≥140 or diastolic ≥90)
Hyperlipidemia Visit with ICD-9 code 272.x, or laboratory values for total cholesterol (>199 mg/dL), low density lipoprotein (>129 mg/dL) or prescription for any statin
Diabetes Mellitus Diabetes Registry
Coronary artery disease Visit with ICD-9 codes:
410.xx - 414.xx (excluding 414.10, 414.11, 414.19), 402.01, 402.11, 402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, 429.4A, 429.9B, 429.9A
Congestive heart failure Visit with ICD-9 codes: 428.0, 428.9, 402.01, 402.11,402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, 429.4A, 429.9B, 429.9A, 428.1
Peripheral vascular disease Visit with ICD-9 codes: 250.7x, 440.xx, 443.81, 443.9
Retinopathy Visit with ICD-9 codes:
250.5, 362.1, 362.10, 362.02A, 362.02, 362.29
CKD Visit with ICD-9 codes (referenced in the US Renal Data Systems Annual report in 2004):
016.0, 095.4, 189.0, 189.9, 223.0, 236.91, 250.4, 271.4, 274.1, 283.11, 403.x1, 404.x2, 404.x3, 440.1, 442.1, 447.3, 572.4, 580-588, 591, 642.1, 646.2, 753.12-753.17, 753.19, 753.2, 794.4
Kidney stones Visit with ICD-9 codes: 592.xx, 274.11
Uric acid/Gout Visit with ICD-9 code 274.0, or laboratory value for uric acid (>7.0 mg/dL)
Laboratory characteristics  
Renal function Laboratory values for serum creatinine (glomerular filtration rate estimated from the four-variable MDRD Study equation, but omitting race and assuming everyone was white)
Inflammation Laboratory values for sedimentation rate(> 20 mm/hr), C-reactive protein (> 0.9 mg/dL) (low serum albumin, wbc count × 2 measures, wbc without bandemia or no eosinophilia, d-dimer, inflammation codes)
Urine Protein Laboratory values for proteinuria (1+ or greater, with negative leucocyte esterase)
Fasting plasma glucose Laboratory values for fasting glucose (>125 mg/dL)