Home blood pressure values during the clinical trial for the gamma-aminobutyric acid (GABA)-enriched white rice compared with the placebo rice. Gray bar represents the test group. Black bar represents the placebo group. (A) Morning blood pressure values (upper, systolic blood pressure; lower, diastolic blood pressure). (B) Rate of change in morning systolic blood pressure (SBP). (C) Rate of change in morning diastolic blood pressure (DBP). (D) Evening blood pressure (upper, SBP; lower, DBP). (E) Rate of change in evening SBP. (F) Rate of change in evening DBP. Values are means ± standard error. *p < 0.05, Student t test.