Luft F C, Fineberg N S, Sloan R S
Hypertension. 1982 Nov-Dec;4(6):805-8. doi: 10.1161/01.hyp.4.6.805.
Previous investigations examining techniques to estimate sodium intake in free-living persons failed to consider a varying intake or were not conducted under circumstances in which the intake was actually known. To examine the utility of 24-hour and nocturnal urine collections as estimation of sodium intake under such conditions, we studied 43 white and black men and women ingesting a known sodium intake for 10 days that was randomly varied daily, with a mean intake of 150 mEq/day + 2 SD (range, 50 to 250 mEq/day). The mean 24-hour sodium excretion (UNaV) per day was and 24-hour UNaV estimated that day's sodium intake accurately for the entire 10 days, the average of several 24-hour collections was required. Nine collections were optimal (r = 0.75). Nocturnal specimens were not helpful; the average of all 10 collections correlated weakly (r = 0.30) with sodium intake. These data suggest that to estimate mean sodium intake accurately in free-living persons, only 24-hour collections are useful, although nocturnal collections are helpful in evaluating compliance with low sodium intake.
以往关于估算自由生活人群钠摄入量方法的研究，要么没有考虑摄入量的变化，要么不是在实际已知摄入量的情况下进行的。为了检验在这种情况下24小时和夜间尿液收集作为钠摄入量估算方法的实用性，我们对43名白人和黑人男性及女性进行了研究，他们连续10天摄入已知量的钠，且每天摄入量随机变化，平均摄入量为150 mEq/天±2标准差（范围为50至250 mEq/天）。每天的平均24小时钠排泄量（UNaV）……并且24小时UNaV在整个10天内准确地估算了当天的钠摄入量，需要多次24小时收集量的平均值。9次收集是最佳的（r = 0.75）。夜间样本没有帮助；所有10次收集量的平均值与钠摄入量的相关性较弱（r = 0.30）。这些数据表明，为了准确估算自由生活人群的平均钠摄入量，只有24小时收集是有用的，尽管夜间收集有助于评估低钠摄入的依从性。 （原文中“每天的平均24小时钠排泄量（UNaV）”后面缺少具体内容）
