Table 1.

Cohort characteristics and 24-h ambulatory and clinic BP protocols for each cohort within the International Database of Ambulatory BP in Renal Patients

VariableAASK (25)CRIC (12)Italian Cohort (8)CKD-JAC (29)Spanish Cohort (22)
Cohort characteristics
 SettingObservational study at the conclusion of an RCTObservational studyKidney clinic–based observational studyObservational studyPCP clinic–based observational study
 Total number of participants6913939489297729,319
 Participants with ABPM6481563489107029,319
 Participants with CKD at time of ABPM587128342810674153
Ambulatory BP protocol
 ABPM DeviceSpaceLabs 90207SpaceLabs 90207/90217SpaceLabs 90207TM-2421SpaceLabs 90207
 FrequencyEvery 30 minEvery 30 minEvery 15 min dayEvery 30 minEvery 20 min
Every 30 min night
 Duration24 h24 h24 h24 h24 h
 Diary of sleep/wake timesRecorded by patientsRecorded by patientsRecorded by patientsRecorded by patientsRecorded by patients
Clinic BP protocol
 DeviceTycos classic hand-held aneroidAneroid sphygmomanometerMercury sphygmomanometerAutomated sphygmomanometerMercury sphygmomanometer or oscillometric devices
 TimingDuring a 60-d window of ABPMAt the time of ABPM placementOn two consecutive days when ABPM was placed and removedAt the time of ABPM placementAt the time of ABPM placement
 TechniqueStandardized; three consecutive seated readings. Average of the last two recorded as clinic BPStandardized; average of three consecutive seated readingsStandardized; average of six readings (three on each day)Standardized; average of three consecutive seated readingsAverage of two readings
  • AASK, African American Study of Kidney Disease and Hypertension Cohort Study; CRIC, Chronic Renal Insufficiency Cohort; CKD-JAC, Chronic Kidney Disease Japan Cohort; RCT, randomized controlled trial; PCP, primary care provider; ABPM, ambulatory blood pressure monitoring.