Validation of the BPLab^® 24-hour blood pressure monitoring system in a pediatric population according to the 1993 British Hypertension Society protocol

Figures & data

Table 2 Grouping of patients according to different parameters

Parameter	SBP (patients)	DBP (patients)	AC (patients)
Blood pressure range^Citation13 above mean + SD	6	5
Blood pressure range^Citation13 below mean − SD	5	5
>70th per centile for weight			5
<30th per centile for weight			6

Abbreviations: SBP, systolic blood pressure; DBP, diastolic blood pressure; AC, arm circumference; SD, standard deviation.

Table 1 Patients’ clinical profile parameters (15 boys, 15 girls)

Parameter	Mean	SD	Minimum	Maximum
Age, years	10.8	3.3	5	15
SBP, mmHg	102.1	17.5	66	155
DBP, mmHg	57.3	8.9	40	90
Arm circumference, cm	24.2	6.1	16	43

Abbreviations: SD, standard deviation; SBP, systolic blood pressure; DBP, diastolic blood pressure.

Table 3 Grading criteria, means, and mean differences in blood pressure for test device and for both observers

BP	Grade	Differences between standard and test device (%)			Mean ± SD (mmHg)	Mean ± SD of differences (mmHg)
		≤5 mmHg	≤10 mmHg	≤15 mmHg
Observer 1
SBP	A	77	96	100	102.9±17.4	0.7±4.9
DBP	A	78	97	100	57.8±8.6	0.7±4.7
Observer 2
SBP	A	74	93	99	101.4±17.7	1.8±4.7
DBP	A	71	96	98	56.7±9.1	1.8±5.0
Final grading
SBP	A	77	96	100	102.9±17.4	0.7±4.9
DBP	A	78	97	100	57.8±8.6	0.7±4.7
Observer comparison
SBP		95	100	100		1.6±2.2
DBP		93	99	100		0.7±3.1

Abbreviations: SBP, systolic blood pressure; DBP, diastolic blood pressure; BP, blood pressure; SD, standard deviation.

Figure 1 Plot of pressure difference between the better observer and the test device, and the mean pressure in 30 patients for SBP (n=90).

Abbreviation: SBP, systolic blood pressure.

Figure 2 Plot of pressure difference between the better observer and the test device, and the mean pressure in 30 patients for DBP (n=90).

Abbreviation: DBP, diastolic blood pressure.

De SwietMFayersPShinebourneEABlood pressure in first 10 years of life: the Brompton studyBMJ1992304P23P26

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