Table 4.
Blood pressure response (mm Hg) to dietary interventions and correlation coefficients for the initial study versus the follow-up study
| BP Response, mmHg | Initial study | Follow-up study | CC (95% CI) | P value | Partial CC* (95% CI) | P value | Partial CC† (95% CI) | P value | Partial CC‡ (95% CI) | P value |
|---|---|---|---|---|---|---|---|---|---|---|
| Response to low sodium | ||||||||||
| SBP | −5.7 (6.4) | −6.8 (7.4) | 0.37 (0.29, 0.44) | <0.0001 | 0.34 (0.26, 0.42) | <0.0001 | 0.34 (0.26, 0.42) | <0.0001 | 0.25 (0.17, 0.34) | <0.0001 |
| DBP | −3.2 (5.0) | −3.7 (4.9) | 0.23 (0.15, 0.32) | <0.0001 | 0.22 (0.14, 0.31) | <0.0001 | 0.23 (0.14, 0.31) | <0.0001 | 0.17 (0.08, 0.25) | 0.0002 |
| MAP | −4.0 (4.9) | −4.8 (5.2) | 0.28 (0.19, 0.36) | <0.0001 | 0.27 (0.19, 0.35) | <0.0001 | 0.27 (0.19, 0.35) | <0.0001 | 0.19 (0.10, 0.27) | <0.0001 |
| Response to high sodium | ||||||||||
| SBP | 5.8 (5.5) | 7.2 (7.6) | 0.37 (0.29, 0.44) | <0.0001 | 0.32 (0.23, 0.39) | <0.0001 | 0.32 (0.23, 0.40) | <0.0001 | 0.28 (0.20, 0.36) | <0.0001 |
| DBP | 3.2 (5.1) | 3.5 (5.1) | 0.34 (0.26, 0.42) | <0.0001 | 0.26 (0.18, 0.35) | <0.0001 | 0.26 (0.18, 0.35) | <0.0001 | 0.25 (0.17, 0.34) | <0.0001 |
| MAP | 4.1 (4.8) | 4.7 (5.5) | 0.36 (0.28, 0.43) | <0.0001 | 0.29 (0.21, 0.37) | <0.0001 | 0.29 (0.21, 0.37) | <0.0001 | 0.27 (0.18, 0.35) | <0.0001 |
| Response to potassium supplementation | ||||||||||
| SBP | −4.0 (5.1) | −3.9 (5.4) | 0.28 (0.20, 0.36) | <0.0001 | 0.24 (0.15, 0.32) | <0.0001 | 0.23 (0.15, 0.32) | <0.0001 | 0.20 (0.11, 0.29) | <0.0001 |
| DBP | −2.2 (4.3) | −1.8 (3.9) | 0.13 (0.04, 0.22) | 0.004 | 0.14 (0.05, 0.23) | 0.002 | 0.14 (0.05, 0.23) | 0.002 | 0.14 (0.05, 0.23) | 0.002 |
| MAP | −2.8 (4.0) | −2.5 (3.9) | 0.19 (0.10, 0.27) | <0.0001 | 0.18 (0.09, 0.26) | <0.0001 | 0.18 (0.09, 0.26) | 0.0001 | 0.17 (0.08, 0.25) | 0.0002 |
BP, blood pressure; CC, correlation coefficient; DBP, diastolic blood pressure; MAP, mean arterial pressure; SBP, systolic blood pressure.
Blood pressure responses are given as mean (standard deviation).
*
Adjusted for age, sex, field center, time interval between the initial study and the follow-up study, and differences in room temperature between the initial study and the follow-up study.
†
Adjusted for variables in a plus baseline body mass index in the initial study.
‡
Adjusted for variables in b plus baseline blood pressure in the initial study.