Table 1.

NHANES variables used as the source of information for independent predictors used in the model

Predictor	NHANES variable(s)
Age, yr	HSAGEIR
Sex	RIAGENDR Gender
Urine albumin-to-creatinine	URXUMASI Urine albumin concentration; URXUCR Urine creatinine concentration
Creatinine level	LBXSCR Creatinine (mg/dl)
Phosphate level	LBXSPH Phosphorus (mg/dl)
Hypertension	BPQ020 Ever told you had high blood pressure; BPQ030 Told had high blood pressure 2+ times; BP040A Taking prescription for hypertension
Diabetes mellitus	DIQ010 Doctor told you have diabetes; DIQ050 Taking insulin now
Coronary artery disease	MCQ160C Ever told you had coronary heart disease; MCQ160D Ever told you had angina/angina pectoris; MCQ160E Ever told you had heart attack
Stroke	MCQ160F Ever told you had a stroke
CHF	MCQ160B Ever told you had congestive heart failure
COPD/asthma	MCQ010: Ever told you had asthma; MCQ160G: Ever told you had emphysema; MCQ160K Ever told you had chronic bronchitis; RDQ133 Doctor prescribe wheezing medication
Anemia	MCQ053 Taking treatment for anemia past 3 mo; LBXHCT Hematocrit; LBXHGB Hemoglobin
Cancer	MCQ220 Ever told you had cancer or malignancy
Arthritis	MCQ160A Doctor ever said you have arthritis
Thyroid disease	MCQ160I Ever told you had thyroid disease
Liver disease	MCQ160L Ever told you had any liver condition
Osteoporosis	OSQ060 Ever told had osteoporosis/brittle bones; OSQ070 Ever treated for osteoporosis
Smoking	BPQ043A Told to stop smoking for hypertension; SMD070 Number cigarettes smoked per day now; SMQ040 Do you now smoke cigarettes

CHF, congestive heart failure; COPD, chronic obstructive pulmonary disease; NHANES, National Health and Nutrition Examination Survey.