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. Author manuscript; available in PMC: 2015 Mar 18.
Published in final edited form as: Hypertension. 2013 Jul 29;62(3):499–505. doi: 10.1161/HYPERTENSIONAHA.113.01034

Table 3.

Blood pressure levels (mm Hg) during dietary interventions and correlation coefficients for the initial study versus the follow-up study

Blood Pressure, mmHg Initial study Follow-up study CC* (95% CI) Partial CC *,† (95% CI)
Baseline
    SBP 118.1 (13.5) 123.3 (15.4) 0.77 (0.73, 0.80) 0.79 (0.75, 0.82)
    DBP 74.3 (9.8) 80.4 (9.9) 0.65 (0.59, 0.70) 0.68 (0.63, 0.72)
    MAP 88.9 (10.2) 94.7 (10.9) 0.72 (0.67, 0.76) 0.75 (0.70, 0.78)
Low-sodium intervention
    SBP 112.4 (12.7) 116.5 (13.6) 0.79 (0.75, 0.82) 0.78 (0.74, 0.81)
    DBP 71.1 (9.4) 76.7 (9.2) 0.65 (0.59, 0.70) 0.65 (0.59, 0.70)
    MAP 84.9 (9.6) 89.9 (9.7) 0.73 (0.68, 0.77) 0.72 (0.68, 0.76)
High-sodium intervention
    SBP 118.2 (13.8) 123.7 (15.1) 0.80 (0.77, 0.83) 0.77 (0.73, 0.80)
    DBP 74.3 (9.9) 80.1 (9.7) 0.63 (0.58, 0.68) 0.63 (0.57, 0.68)
    MAP 89.0 (10.5) 94.6 (10.5) 0.73 (0.69, 0.77) 0.71 (0.66, 0.75)
Potassium Supplementation
    SBP 114.2 (13.6) 119.7 (14.5) 0.82 (0.79, 0.85) 0.79 (0.75, 0.82)
    DBP 72.1 (9.4) 78.4 (9.6) 0.66 (0.61, 0.71) 0.64 (0.59, 0.69)
    MAP 86.1 (10.0) 92.1 (10.3) 0.76 (0.72, 0.80) 0.73 (0.68, 0.77)

CC, correlation coefficient; DBP, diastolic blood pressure; MAP, mean arterial pressure; SBP, systolic blood pressure.

Blood pressure levels are given as mean (standard deviation).

*

All P values for correlation coefficients are less than 0.0001.

†

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.