In contrast , the slopes of the regression lines were flatter for AZD@ , particularly for the log ( Sway ) - SPV relation ( estimate slope , AZD@ @mg vs. lorazepam , difference -LSB- @ % confidence interval -RSB- , P value -@ vs. -@ , @ -LSB- @ , @ -RSB- , P = @ ) and the VASalertness - SPV relationship ( @ vs. @ , -@ -LSB- -@ , -@ -RSB- , P = @ ) .