The authors randomly assigned 810 adults with prehypertension or early-stage hypertension to receive advice on changing diet
and exercise, a behavioral intervention, or the behavioral intervention plus the Dietary Approaches to Stop Hypertension (DASH)
diet. Relative to the advice only group, the odds ratios for having hypertension at 18 months were 0.83 (95% CI, 0.67 to 1.04)
for the behavioral intervention group and 0.77 (CI, 0.62 to 0.97) for the behavioral intervention plus DASH group. Absolute
blood pressure at 18 months was lower in the behavioral intervention groups, but the difference was not statistically significant.