Table 2 Relationship between age, sex, blood pressure, body mass index, and sodium excretion

 30–40

384

10.3 ± 2.4

 40–50

689

10.7 ± 2.5

 50–60

620

11.2 ± 2.7

 60–70

482

11.3 ± 2.9

  ≥70

281

11.3 ± 3.1

 P^a

<0.001

 Male

914

11.0 ± 2.7

 Female

1542

10.9 ± 2.7

 P

0.73

 Q1 80–112

546

10.4 ± 2.3

 Q2 113–126

670

10.5 ± 2.4

 Q3 127–142

568

11.2 ± 2.7

 Q4 143–230

672

11.7 ± 3.1

 P^a

<0.001

 Q1 50–69

484

10.3 ± 2.5

 Q2 70–77

597

10.6 ± 2.5

 Q3 78–85

686

11.0 ± 2.6

 Q4 86–124

689

11.7 ± 3.0

 P^a

<0.001

 15.7–21.3

614

10.2 ± 2.5

 15.8–23.4

611

10.7 ± 2.6

 23.5–25.6

617

11.2 ± 2.6

 25.7–39.6

614

11.8 ± 2.9

 P^a

<0.001

  < 1.7

2169

10.9 ± 2.7

  ≥ 1.7

287

11.1 ± 2.9

 P

0.53

  < 5.2

1565

10.9 ± 2.6

  ≥ 5.2

891

11.1 ± 2.9

 P

0.02

  < 3.4

1981

10.9 ± 2.6

  ≥ 3.4

475

11.3 ± 3.0

 P

<0.001

  < 6.0

2156

10.9 ± 2.7

  ≥ 6.0

300

11.0 ± 2.9

 P

0.88