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Kaplan-Meier curves for development of microalbuminuria in patients with normoalbuminuria (A) and progression of overt proteinuria in those with microalbuminuria (B) grouped according to the median cutoff value of urinary type IV collagen level. The difference between two subgroups was compared by a log-rank test. ——, patients above the value (6.36 μg/g Cr; n = 127); – – –, patients below the value (<6.36 μg/g Cr; n = 127).
