Table 2.

Systolic blood pressure parameters at end of run-in period according to racial background^a

		Racial background
Mean BP parameter, mm Hg	Total cohort	Nonblack	Black	P valueb
Office SBPc	131±11	131±11	131±11	>0.90
24-hour ASBP	131±11	131±11	131±11	>0.90
Daytime ASBPd	137±12	138±12	137±21	0.23
Nighttime ASBPe	122±12	121±12	123±12	0.17
Mean awake SBP	137±11	137±11	136±11	0.41
Mean sleep SBP	120±12	118±12	121±11	0.06
Nocturnal decline in ASBPf	15±9	17±10	14±8	<0.001
Preawake SBP surgeg	13±10	14±11	11±10	0.01
Sleep-through SBP surgeh	19±11	21±11	17±10	0.001

Abbreviations: ASBP, ambulatory systolic blood pressure; BP, blood pressure; SBP, systolic blood pressure.

^aContinuous variables are expressed as means ± SDs.

^b P value for difference; significance determined by t test.

^cAverage SBP over 3 screening visits and 4 separate days during the last week of run-in.

^dAverage SBP between 8 am and 6 pm.

^eAverage SBP between 10 pm and 6 am.

^fAverage daytime SBP minus average nighttime SBP.

^gAverage SBP in 2 hours postwakening minus average SBP in 2 hours prewakening

^hAverage SBP in 2 hours postwakening minus average SBP in nighttime hour with lowest SBP.