Figure 2.

In a randomized, controlled trial of dietary potassium restriction over 2 years, there was a marked reduction in serum potassium in the intervention arm (black circles) that continued for the duration of the study. Data are expressed as mean serum potassium (±SEM) for intervention (black circles) and control (white circles). The numbers analyzed at each time point are stated below the x axis as control and intervention, respectively.