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

Variable	AASK (25)	CRIC (12)	Italian Cohort (8)	CKD-JAC (29)	Spanish Cohort (22)
Cohort characteristics
Setting	Observational study at the conclusion of an RCT	Observational study	Kidney clinic–based observational study	Observational study	PCP clinic–based observational study
Total number of participants	691	3939	489	2977	29,319
Participants with ABPM	648	1563	489	1070	29,319
Participants with CKD at time of ABPM	587	1283	428	1067	4153
Ambulatory BP protocol
ABPM Device	SpaceLabs 90207	SpaceLabs 90207/90217	SpaceLabs 90207	TM-2421	SpaceLabs 90207
Frequency	Every 30 min	Every 30 min	Every 15 min day	Every 30 min	Every 20 min
			Every 30 min night
Duration	24 h	24 h	24 h	24 h	24 h
Diary of sleep/wake times	Recorded by patients	Recorded by patients	Recorded by patients	Recorded by patients	Recorded by patients
Clinic BP protocol
Device	Tycos classic hand-held aneroid	Aneroid sphygmomanometer	Mercury sphygmomanometer	Automated sphygmomanometer	Mercury sphygmomanometer or oscillometric devices
Timing	During a 60-d window of ABPM	At the time of ABPM placement	On two consecutive days when ABPM was placed and removed	At the time of ABPM placement	At the time of ABPM placement
Technique	Standardized; three consecutive seated readings. Average of the last two recorded as clinic BP	Standardized; average of three consecutive seated readings	Standardized; average of six readings (three on each day)	Standardized; average of three consecutive seated readings	Average 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.