Significantly Reduced Blood Pressure Measurement Variability for Both Normotensive and Hypertensive Subjects: Effect of Polynomial Curve Fitting of Oscillometric Pulses

Table 3

Mean within-subject variabilities of SBP, MAP, and DBP measured from different techniques, separately for both the normotensive and hypertensive groups. The measurement variability was calculated from the SD of the three repeated measurements (in mmHg) and also expressed as a coefficient of variability (CV = 100 × SD/mean, %).

Subject groups	Variability parameters	Auscultatory			Automated-without curve fitting			Automated-with curve fitting
		SBP	MAP	DBP	SBP	MAP	DBP	SBP	MAP	DBP
Normotensive	SD of repeats	2.5	1.8	1.9	3.6	3.7	2.6			2.3
Hypertensive		4.2	2.7	2.8	6.5	6.7	3.4			3.0
Normotensive	CV (%)	2.1	2.0	2.6	3.0	4.3	3.5			3.3
Hypertensive		2.7	2.5	3.2	4.2	5.8	3.8			3.5

Note. and mean that there is a significant difference in comparison with the automatic technique without polynomial curve fitting.