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Polynominal regression and curve fitting of estimated glomerular filtration rate (eGFR) across the grade of urinary albumin-to-creatinine ratio (ACR). ACR was stratified into 12 grades: grade 1, <5 mg/g; grade 2, 5 to 9 mg/g; grade 3, 10 to 14 mg/g; grade 4, 15 to 19 mg/g; grade 5, 20 to 24 mg/g; grade 6, 25 to 29 mg/g; grade 7, 30 to 59 mg/g; grade 8, 60 to 89 mg/g; grade 9, 90 to 149 mg/g; grade 10, 150 to 299 mg/g; grade 11, 300 to 499 mg/g; and grade 12, ≥500 mg/g.
