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The change in body weight during the past 6 weeks (mean, 38 d) vs. (A) the intake of fluid on the day of admission on a linear scale (B) whether fluid intake was higher or lower than 800 mL on the day of admission (C) whether the urine was normal or concentrated (urine-specific gravity ≥1.025), and (D) whether none, one of both of these two variables was present in the patient.
