Figure 2.

Box plots of plasma total CO₂ (TCO₂) (left) and 8-hour urine net acid excretion (8h NAE) (right) in patients with CKD stage 4 at baseline and 1-year follow-up. HCO₃ recipients were given oral NaHCO₃ at 1.0 mEq/kg lean body weight per day; the fruit and vegetable recipients were given fruits and vegetables in amounts designed to reduce potential renal acid load by half. The bottom and top of the boxes span the 25th and 75th percentile of data points. The dark bar within the box indicates the 50th percentile or median. The whiskers indicate 1.5 times the interquartile range from the lower and upper quartiles. F+V, fruits and vegetables; F/U, follow-up. *P<0.05 versus respective baseline; ⁺P<0.05 versus respective HCO₃ group.