Significant independent predictors of mortality at study entry were age , diabetes mellitus , history of hypertension , systolic blood pressure ( hazard ratio -LSB- HR -RSB- , @ per @ mm Hg increase ) , serum hemoglobin < @ g/dL ( HR , @ ) , renal function ( HR , @ per estimated glomerular filtration rate decrease of @ mL/min ) , and body mass index ( HR , @ per @ kg/m@ decrease ) .