When the changes in blood pressure over the study period were compared between groups by ITT , the CPAP group achieved a greater decrease in @-hour mean blood pressure ( @ mm Hg -LSB- @ % CI , @ to @ -RSB- ; P = @ ) and @-hour DBP ( @ mm Hg -LSB- @ % CI , @ to @ -RSB- ; P = @ ) , but not in @-hour SBP ( @ mm Hg -LSB- @ % CI , -@ to @ -RSB- ; P = @ ) compared with the control group .