Blood pressure in the intervention group decreased with 8.1 ( 95 % CI = 4.8 to 11.3 ) / 1.1 ( 95 % CI = -1.0 to 3.2 ) compared to -0.2 ( 95 % CI = -3.8 to 3.3 ) / -0.5 ( 95 % CI = -2.9 to 1.8 ) in the control group .