Multiple imputation for missing values gave similar results : the mean baseline was @ / @ mm Hg in the intervention group vs @ / @ mm Hg in the control group , and at @ months , the mean was @ / @ mm Hg in the intervention group vs @ / @ mm Hg in the control group , with a difference of @ mm Hg ( @ % CI , @-@ @ ) for systolic and @ mm Hg ( @ % CI , @-@ @ ) for diastolic blood pressure between groups .