Table 3 Comparison of various markers of dehydration in two cohorts

Dehydration score

3 (0–8)

0 (0–0)

<0.0001

Pre-hydration systolic blood pressure z-score

0.57 (-0.18-1.54)

0.97 (0.02-1.90)

n.s.

Pre-hydration diastolic blood pressure z-score

0.67 (-0.09-1.21)

0.24 (-0.42, 1.10)

n.s.

Pre-hydration heart rate

134 (112, 158)

97 (84, 130)

<0.0001

Urine Na/K ratio [17]

0.69 (0–4.4)

2.3(0–56)

0.789(0.03)

<0.0001

Serum Osmolality [mOsm] [18]

286 (231–684)

289 (199–391)

0.11

Urine Na [mmol/L] [19]

66.0 ± 55.6

144 ± 74

0.798(0.03)

<0.0001

FeNa [20]

0.19 (0–0.89)

0.52 (0–10.4)

0.753(0.03)

<0.0001

FeUrea [21]

0.398 (0.678-0.96)

0.377 (0.055-4.504)

n.s.

Serum bicarbonate [mmol/L]

20 (10–27)

24 (18–30)

0.821(0.03)

<0.0001

Blood urea [g/L]

5.7 (1.2-41)

5 (2.6-9.2)

0.613(0.05)

0.01

Serum creatinine [μmol/L]

38 (16–408)

45 (3.8-97)

0.666(0.04)

0

Schwartz eGFR [mL/min/1.73 m ² ]

131.6 ± 32.3

136.9 ± 23.2

0.18

Cystatin C [mg/L]

0.67 (0.43-2.89)

0.66 (0.44-1.08)

n.s.

Cystatin C eGFR [mL/min/1.73 m ² ]

144.0 ± 36.9

147.6 ± 25.1

n.s.

Urine osmolality [mOsm]

805 ± 306

876 ± 402

0.2

Urinary microalbumin/creatinine ratio [mg/mmol] [22]

4.4 (0.4-61.1)

2.3 (0.3-9.4)

0.69 (0.04)

<0.0001

Urinary α1-microglobulin/creatinine ratio [mg/mmol] [22]

1.75 (0.30-14.70)

0.70 (0.20-11.30)

0.809(0.04)

P < 0.001