Table 2. Comparison of changes in SBP and DBP from baseline among patients presenting to the preoperative clinic with hypertension.

Data are presented as mean (SD).

SBP = systolic blood pressure; DBP = diastolic blood pressure; mmHg = millimeters of mercury

Time	Firm A (N = 75)	Firm B (N = 60)	Difference (95% CI)	P-value
SBP changes (mmHg)
3–6 months	-2.50 (-6.25 to 1.44)	-1.69 (-5.91 to 2.54)	-0.82 (-6.47 to 4.84)	0.78
6–9 months	-4.68 (-8.37 to 0.99)	-3.02 (-8.40 to 0.55)	-0.75 (-6.56 to 5.05)	0.80
9–12 months	-2.31 (-6.18 to 1.57)	-4.27 (-8.66 to 0.11)	1.97 (-3.89 to 7.82)	0.51
DBP changes (mmHg)
3–6 months	-1.34 (-3.33 to 0.65)	-0.30 (-2.55 to 1.96)	-1.-4 (-4.06 to 1.97)	0.50
6–9 months	-1.55 (-3.52 to 0.42)	-1.34 (-3.72 to 1.03)	-0.32 (-3.30 to 2.89)	0.90
9–12 months	-1.75 (-3.80 to 0.29)	-1.72 (-4.05 to 0.62)	-0.03 (-3.14 to 3.08)	0.98