Table 4 Summary of measured 24-hour and predicted 24-hour urinary Na excretion, expressed as salt equivalentsa per day

From: Prediction of 24-hour sodium excretion from spot urine samples in South African adults: a comparison of four equations

 

Measured

INTERSALT

Tanaka

Kawasaki

Mage

All, n = 438

7.0 (4.4–10.5)

3.0 (2.5–3.5)

8.0 (6.8–9.5)

13.1 (10.2–16.7)

25.5 (15.7–41.7)

Men, n = 106

7.7 (4.6–11.2)

3.7 (3.1–4.2)

8.1 (6.9–9.1)

18.5 (14.8–22.3)

25.9 (16.6–42.5)

Women, n = 332

6.5 (4.4–10.3)

2.8 (2.4–3.2)

7.9 (6.7–9.6)

11.9 (9.7–14.9)

25.4 (15.2–41.4)

Black, n = 319

6.4 (4.4–10.6)

3.0 (0 (2.6–3.5)

8.0 (6.8–9.5)

13.2 (10.2–16.7)

27.0 (16.7–43.1)

Other ethnicity, n = 119

7.5 (4.3–10.3)

2.8 (2.4–3.4)

8.0 (6.5–9.7)

12.9 (9.8–16.5)

22.2 (12.0–35.0)

50 years and above, n = 284

6.1 (4.2–8.9)

2.9 (2.3–3.4)

8.0 (6.5–9.6)

12.8 (9.9–16.5)

23.1 (13.1–40.0)

Below 50 years, n = 154

8.5 (5.1–13.9)

3.1 (2.8–3.5)

8.0 (6.9–9.2)

13.7 (10.5–16.8)

30.7 (20.6–44.2)

Differenceb

 

3.77 (1.64; 7.09)

− 1.28 (− 3.52; 1.97)

− 6.24 (− 9.45; − 2.22)

− 17.18 (− 31.96; − 8.42)

P valuesb

 

< 0.001

0.0118

< 0.001

< 0.001

  1. All data are shown as median (IQR, interquartile range)
  2. a24-hour salt (NaCl) equivalent (g/day) = (24-hour Na (mg/day)/1000) × 2.5
  3. bDifference is a summary variable of the differences between the measured and predicted 24-hour urinary salt excretion for each participant, assessed using the Wilcoxon Signed Rank Test
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