Analysis of urine volume and dietary salt intake assessed by two 24 hours urine specimens
10.16462/j.cnki.zhjbkz.2020.03.007
- Author:
Jian- wei XU
1
;
Ya-min BAI
;
Min LIU
;
Xiao-rong CHEN
;
Liu-xia YAN
;
Jing WU
Author Information
1. National Center for Chronic and Noncommunicable Disease Control and Prevention,Chinese Center for Dis- ease Control and Prevention ,Beijing 100050,China
- Publication Type:Journal Article
- Keywords:
Urine volume;
Salt;
24 h urine
- From:
Chinese Journal of Disease Control & Prevention
2020;24(3):279-283
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze urine volume and dietary salt intake assessed by two 24 h urine specimens,to discuss its application value for evaluating population level and individual level dietary salt intake. Methods The subjects aged 18-69 years were selected from four counties in Shandong Province and Jiangsu Province from 2013 to 2014 by using multi-stage stratified cluster random sampling method. A questionnaire survey was conducted and two 24 h urine with an interval of one day were collected. The differences between two 24 h urine volume,and the dietary salt intake between two 24 h urine were assessed at individual level and population level. Results A total of 1 288 subjects was( 42.3± 14.0) years old,of which 626( 48.6%) were males. The average urine volume of the subjects was ( 1 462±437) ml. The first 24 h urine volume ( 1 427±488) ml was lower than the second 24 h urine volume ( 1 498± 552) ml ( t = -4.439,P<0.001) . The dietary salt intake was ( 9.8±3.3) g,and the dietary salt intake of males ( 10.1±3.5) g was higher than that of females ( 9.5±3.1) g ( t = 3.09,P= 0.002) . There was a significant difference in dietary salt intake among different age groups ( F= 7.57,P<0.001) . The dietary saltintake of 1 136 ( 88.2%) subjects was higher than the recommended level. At the individual level,the participants with the absolute difference with 1g between the subjects’two 24 h urinary salt excretion was 279 ( 21.7%) ,and the participants with the absolute difference with >3 g was 48.5%. At the population level,the first 24 h urinary salt excretions ( 9.9 ± 4.1) g was similar to that in the second 24 h urine and ( 9.7±4.0) g ( P= 0.1021) . The intraclass correlation coefficients between salt excretions in the two 24 h urine was 0.508( 95% CI: 0.451-0.559) . Conclusion The results of this study suggest that 24 h urinary salt excretion can better assess the salt intake at population level,but cannot accurately reflect the individual’s salt intake.