In the subset of patients with valid ambulatory BP , no difference in 24-h average DBP [ n = 181 ; 6.7 ( 8.7 , 4.6 ) zofenopril + HCTZ vs. 6.3 ( 8.8 , 3.7 ) mmHg irbesartan + HCTZ , P = 0.810 ] and SBP reductions [ 11.7 ( 15.4 , 8.0 ) vs. 12.6 ( 17.2 , 8.0 ) mmHg , P = 0.758 ] were observed between the two treatment groups .