Table 2 Changes in systolic and diastolic blood pressure in PR versus NR, in 1219 participants and participants by addition of extra salt from outside of study

Systolic blood pressure

 Changes from baseline by visit

  6-month

 − 3.1 ± 20.8

 − 3.1 ± 19.6

0.4 (− 2.1, 2.9)

0.741

0.046

0.2 (− 2.9, 3.3)

0.076

7.2 (− 1.4, 15.8)

0.412

  12-month

0.8 ± 21.1

1 ± 20.3

 − 0.80 (− 3.2, 1.6)

0.510

 − 1.3 (− 4.2, 1.7)

1.8 (− 6.6, 10.2)

  18-month

 − 5.1 ± 20.5

 − 5.9 ± 19.8

0.9 (− 1.7, 3.5)

0.509

 − 0.2 (− 3.3, 2.9)

6.6 (− 2.2, 15.4)

  24-month

 − 4 ± 20.5

 − 0.7 ± 20.6

 − 3.0 (− 5.6, − 0.5)

0.020

 − 3.6 (− 6.5, − 0.7)

2.2 (− 6.1, 10.5)

 Changes from baseline by season

  Warm season

 − 4.4 ± 18.1

 − 6.9 ± 18.2

2.8 (− 1.4, 6.9)

0.191

 < 0.001

2.5 (− 2.0, 6.9)

 < 0.001

7.3 (− 1.4, 16.0)

0.063

  Cold season

 − 1.1 ± 19.9

0.5 ± 19

 − 2.1 (− 6.1, 1.9)

0.300

 − 2.3 (− 6.5, 1.9)

0.9 (− 7.0, 8.8)

 Mean change over 2 years

  Overall change^a

 − 2.5 ± 18.6

 − 2.1 ± 18.1

 − 0.6 (− 4.5, − 3.4)

0.774

 − 0.8 (− 5.0, 3.4)

3.3 (− 4.0, 10.7)

Diastolic blood pressure

 Changes from baseline by visit

  6-month

 − 0.8 ± 11.4

 − 2.5 ± 10.2

1.7 (0.3, 3.1)

0.018

 < 0.001

2.0 (0.2, 3.7)

 < 0.001

4.6 (− 0.2, 9.2)

0.071

  12-month

1.5 ± 11.3

0.5 ± 10.6

0.6 (− 0.7, 1.9)

0.371

0.2 (− 1.5, 1.8)

3.1 (− 1.4, 7.6)

  18-month

 − 2.0 ± 10.9

 − 4.0 ± 10.2

1.7 (0.3, 3.2)

0.021

1.1 (− 0.6, 2.8)

4.8 (0.0, 9.5)

  24-month

 − 1.3 ± 11.0

0.8 ± 11.3

 − 2.0 (− 3.4, − 0.6)

0.0045

 − 2.3 (− 3.9, − 0.6)

 − 0.4 (− 4.9, 4.0)

 Changes from baseline by season

  Warm season

 − 1.1 ± 9.9

 − 3.9 ± 8.6

2.4 (0.4, 4.3)

0.017

 < 0.001

2.3 (0.1, 4.5)

 < 0.001

3.6 (− 0.7, 8.0)

0.022

  Cold season

0.3 ± 10.5

0.7 ± 9.9

 − 0.9 (− 2.7, 1.0)

0.351

 − 1.1 (− 3.1, 0.9)

 − 0.7 (− 4.6, 3.3)

 Mean change over 2 years

  Overall change^a

 − 0.4 ± 9.8

 − 0.9 ± 9.5

0.2 (− 1.6, 1.9)

0.8461

 − 0.0 (− 2.0, 1.9)

0.9 (− 2.8, 4.6)