title: Agreement of blood pressure measurements between random-zero and standard mercury sphygmomanometers.
abstract: 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.
authors.affiliation: Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana 70112, USA.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Yang
authors.forename: Dongfeng
authors.initials: D
authors.lastname: Gu
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Cashell E
authors.initials: CE
authors.lastname: Jaquish
authors.forename: D C
authors.initials: DC
authors.lastname: Rao
authors.forename: Xigui
authors.initials: X
authors.lastname: Wu
authors.forename: James E
authors.initials: JE
authors.lastname: Hixson
authors.forename: Xiufang
authors.initials: X
authors.lastname: Duan
authors.forename: Tanika N
authors.initials: TN
authors.lastname: Kelly
authors.forename: L Lee
authors.initials: LL
authors.lastname: Hamm
authors.forename: Paul K
authors.initials: PK
authors.lastname: Whelton
authors.forename: Jiang
authors.initials: J
authors.lastname: He
mesh_terms: 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