Association between sodium excretion and hydration status by Free Water Reserve: a cross-sectional analysis in adolescents

Table 2 Urinary data on sodium excretion and hydration status (13–18 years)^a

	Boys	Girls	p
Creatinine (mg/d)^a,b	1440.0 (1164.5; 1717.0)	1094.0 (978.0; 1238.5)	<0.001
Volume (ml/d)^a,b	1100.0 (837.5; 1300.0)	1025.0 (700.0; 1412.5)	0.923
Osmolality (mosm/kg)^c,d	715.7 ± 172.3	597.42 ± 193.1	0.247
FWR (ml/d)^a,b	173.2 (−137.5; 509.2)	373.2 (−105.7; 832.1)	0.059
Euhydration status (%)^e	59.8	68.6	0.195
Risk of Hypohydration status (%)^e	40.2	31.4	0.195
Sodium (mEq/d)^a,b	158.5 (114.5; 197.8)	117.5 (95.5; 159.5)	<0.001
Sodium (mg/d)^a,b,f	3645.5 (2633.5; 4548.3)	2702.5 (2196.5; 3668.5)	<0.001
Salt intake estimation (g/d)^a,b,f	9.3 (6.7; 11.6)	6.9 (5.6; 9.3)	<0.001

^aValues are medians (quartile 1 and quartile 3)
^bAnalysis by Mann–Whitney U test
^cValues are means ± SD
^dAnalysis by Student t test for continuous variables
^eAnalysis by χ2 for categorical variables
^fEstimated salt intake from urinary sodium excretion (393 mg sodium = 1 g salt)

ISSN: 2055-0928