Meta-regression analyses for systolic (A) and diastolic (B) blood pressure. (A) Meta-regression analyses for systolic blood pressure (SBP). The difference in SBP reduction between whites and blacks was significantly blunted by increasing doses of ACE inhibitors (p = 0.048). None of the other associations were statistically significant. Meta-regression analyses for diastolic blood pressure (DBP). (B) Meta-regression analyses for diastolic blood pressure (DBP). None of the associations were statistically significant but there was a trend toward lesser difference in DBP reduction between whites and blacks when greater doses of ACE-inhibitors were used.