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Kaplan-Meier kidney survival curves for patients with IgA nephropathy, according to 24-h urine protein (A), albumin-to-creatinine ratio (B), and PCR (C). Time zero was the time of kidney biopsy. The divisions among the three groups were based on the levels of proteinuria: group 1: ≤ 0.5, group 2: 0.5–1.0, group 3: ≥1.0.
