Shortt C, Flynn A, Morrissey P A
Department of Nutrition, University College, Cork, Ireland.
Eur J Clin Nutr. 1988 Jul;42(7):605-9.
The sodium, potassium and creatinine contents of three non-consecutive 24-h urine samples collected by 34 selected adult individuals (10 m; 24 f) living in Cork City were determined. The pooled mean 24-h excretion of sodium and potassium in collections adjudged to be complete were 152 mmol and 78 mmol, respectively. There was no significant difference between group average weekday and weekend-day excretion of Na or K, for either males or females. This suggests that weekend 24-h urinary collections, which most subjects find more convenient, are suitable for studies of sodium and potassium intakes of groups. The ratios of intra- to inter-individual variation for 24-h urinary sodium were 1.4 and 2.1 for males and females, respectively. The corresponding ratios for 24-h urinary potassium were 6.6 for males and 4.9 for females. These ratios indicated that there were large individual day-to-day variations in urinary sodium and potassium excretion in this group. It was estimated that a sample size of 35-60 individuals would be required to estimate group mean sodium and potassium intakes by means of single 24-h urine collections.
对居住在科克市的34名选定成年人（10名男性；24名女性）收集的三个非连续24小时尿液样本中的钠、钾和肌酐含量进行了测定。在判定为完整的收集样本中，钠和钾的合并平均24小时排泄量分别为152毫摩尔和78毫摩尔。男性或女性在工作日和周末的钠或钾排泄量的组平均水平之间没有显著差异。这表明，大多数受试者认为更方便的周末24小时尿液收集适用于研究群体的钠和钾摄入量。男性和女性24小时尿钠的个体内变异与个体间变异之比分别为1.4和2.1。24小时尿钾的相应比值男性为6.6，女性为4.9。这些比值表明该组人群尿钠和尿钾排泄存在较大的个体间每日差异。据估计，通过单次24小时尿液收集来估计群体平均钠和钾摄入量需要35至60名个体的样本量。
