Bland-Altman plots comparing the systematic differences of nighttime systolic (Panel A) and diastolic (Panel B) blood pressure defined by self-reported, fixed-time* and actigraphy-derived times from ambulatory blood pressure monitoring period 1 (n = 330).
*Using the definition of the International Database of Ambulatory Blood Pressure in relation to Cardiovascular Outcome (IDACO) for Europeans (nighttime: 0000 to 0600).
SBP: systolic blood pressure.
DBP: diastolic blood pressure.
CI: confidence interval.