Table 2. Characteristics of the study population and the pre-and-post-intervention changes in systolic (SBP) and diastolic blood pressure (DBP) in the randomized salt substitute trial, by intervention group.
| Variables | Intervention | Control | P values |
|---|---|---|---|
| Population characteristics | |||
| Number of families | 129 | 133 | |
| Number of participants | 253 | 263 | |
| Mean age (yrs±SD) | 59.3±8.7 | 59.2±8.7 | 0.869 |
| Women (%) | 51.0 | 49.0 | 0.598 |
| Baseline blood pressure (mmHg) | |||
| SBP | 128.9±13.5 | 126.8±13.5 | 0.083 |
| DBP | 82.0±10.1 | 81.3±11.7 | 0.482 |
| Change in blood pressure from baseline (mmHg) | |||
| SBP | -4.7±11.0 | -2.6±10.3 | <0.001 |
| DBP | -2.4±7.9 | -1.1±8.5 | <0.001 |
After 2 months of intervention, SBP in both groups fell but in the intervention group declined significantly more. DBP showed the same trend (Table 2). After adjusting for baseline blood pressure and clustering effect, it showed that SBP and DBP in intervention group declined significantly more than that in control group. There was no adverse event reported during the trial in either group.