Agreement of blood pressure measurements between random-zero and standard mercury sphygmomanometers.
The random-zero sphygmomanometer has been widely used in observational studies and clinical trials for blood pressure measurement. We examined the agreement of blood pressure measurements between random-zero and standard mercury sphygmomanometers among 2007 Chinese study participants aged 15 to 60 years. Three blood pressure readings were obtained by trained observers using random-zero and standard mercury sphygmomanometers, respectively, in a random order. Overall, blood pressure readings obtained using the random-zero device were significantly lower than those obtained with the standard mercury sphygmomanometer, with a mean difference ranging from -3.0 to -2.7 mm Hg for systolic and -1.4 to -0.9 mm Hg for diastolic blood pressure (all P < 0.01). Correlation coefficients between mean blood pressure measurements obtained using the random-zero and standard mercury sphygmomanometers were high (0.90 for systolic and 0.85 for diastolic blood pressure, both P < 0.0001). In conclusion, our study indicated that there was strong agreement between blood pressure measurements obtained using the random-zero and standard mercury sphygmomanometers although blood pressure values were on average lower with the random-zero sphygmomanometer.
Yang
Wenjie
W
Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana 70112, USA.
Gu
Dongfeng
D
Chen
Jing
J
Jaquish
Cashell E
CE
Rao
D C
DC
Wu
Xigui
X
Hixson
James E
JE
Duan
Xiufang
X
Kelly
Tanika N
TN
Hamm
L Lee
LL
Whelton
Paul K
PK
He
Jiang
J
D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D019722:Sphygmomanometers; D055815:Young Adult