Table IV.

 Classification of Patients With Low (<100 mEq/d) vs Not Low (≥100 mEq/d) Sodium Excretion

	24‐H Urine Na Excretion
	<100	≥100
Random samplea
Predicted 24‐h Na excretion <100	4	7
Predicted 24‐h Na excretion ≥100	1	24
Morning sampleb
Predicted 24‐h Na excretion <100	5	8
Predicted 24‐h Na excretion ≥100	2	21
Evening samplec
Predicted 24‐h Na excretion <100	12	6
Predicted 24‐h Na excretion ≥100	0	27

^aκ=0.38, P=.01. ^bκ=0.33, P=.03. ^cκ=0.71, P<.001.