Skip to main content

Table 3 Hydration status indicators and its relation to sodium excretion divided in quartiles and according to upper limit recommendation (2000 mg/d) and by sexa

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

 

Sodium excretion (mg/d)

  

Sodium excretion

 
 

Q1

Q2

Q3

Q4

p b

ρ (p) c

<2000 mg/d

> = 2000 mg/d

p d

Boys (n)

20

21

21

20

  

8

74

 

 Volume (ml/d)a,b

775.0 (600.0; 987.5)

1000.0 (725.0; 1250.0)

1100.0 (900.0; 1175.0)

1325.0 (1150.0; 1600.0)

<0.001

0.585 (<0.001)

725.0 (450.0; 900.0)

1100.0 (900.0; 1300.0)

0.001

 Osmolality (mosm/kg)a,b

677.5 (527.3; 791.3)

703.0 (547.5; 922.0)

776.0 (699.5; 847.0)

761.0 (553.3; 832.8)

0.337

0.150 (0.178)

704.5 (620.8; 828.8)

725.0 (565.3; 824.0)

0.702

 FWR (ml/d)a,b

−78.0 (−293.2; 349.8)

29.5 (−341.6; 528.3)

181.3 (−97.9; 338.3)

459.9 (79.7; 961.0)

0.015

0.358 (0.001)

−122.9 (−624.8; 189.6)

226.4 (−108.6; 535.7)

0.036

 Risk Hypo-hydration status (%)c

65.0

47.6

33.3

15.0

0.011

 

75.0

36.5

0.035

Girls (n)

29

30

30

29

  

26

92

 

 Volume (ml/d)a,b

775.0 (550.0; 1075.0)

975.0 (737.5; 1270.0)

975.0 (767.5; 1312.5)

1450.0 (1250.0; 1700.0)

<0.001

0.512 (<0.001)

737.5 (537.5; 1012.5)

1200.0 (800.0; 1487.5)

<0.001

 Osmolality (mosm/kg)a,b

589.0 (415.5; 750.5)

544.0 (397.3; 686.3)

689.0 (455.5; 793.3)

572.0 (497.5; 656.0)

0.201

0.113 (0.222)

564.5 (420.3; 738.8)

528.0 (458.3; 743.8)

0.610

 FWR (ml/d)a,b

44.6 (−304.2; 517.5)

304.2 (−134.5; 813.7)

165.4 (−215.2; 758.0)

748.2 (509.0; 964.5)

0.004

0.323 (<0.001)

52.6 (−293.4; 464.2)

512.0 (−43.4; 867.3)

0.022

 Risk Hypo-hydration status (%)c

44.8

30.0

36.7

13.8

0.073

 

46.2

27.2

0.065

  1. aValues are median (percentile 25; percentile 75)
  2. bAnalysis by Kruskal Wallis
  3. cSpearman correlation test
  4. dAnalysis by Mann–Whitney U test