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ESRD rate by urinary oxalate (U[ox]) quartile during follow-up (f/u). ESRD rates were similar for the lower three quartiles (Q) but increased for a urinary oxalate level >1.87 mmol/1.73 m2 per 24 hours (hazard ratio, 3.30; 95% confidence interval, 1.17 to 9.33; P=0.02).
