['To test the hypothesis that left-ventricular hypertrophy (LVH) is better associated with aortic, than brachial, 24-h average blood pressure (BP) in individuals with hypertension.', 'The office aortic BP is associated better with organ damage, such as LVH, than the office brachial BP; whether the 24-h average aortic BP associates better with LVH, than the 24-h average brachial BP, has never been tested.', 'Aortic ambulatory BP monitoring (ABPM) was performed with a novel validated oscillometric cuff-based BP recording device, also used for simultaneous brachial ABPM, and the application of pulse wave analysis method. Office brachial and aortic BP were assessed with validated oscillometric recording device and pulse wave analysis, respectively; left-ventricular mass was measured by ultrasound.', 'Regression analysis performed in 229 individuals (aged 54.3\u200a±\u200a14.6 years; 56% men; 75% hypertensive patients) showed that the 24-h average aortic SBP was significantly better associated with left-ventricular mass index and LVH than the 24-h average brachial, as well as, office (brachial or aortic) SBP, independently of age, sex, obesity or treatment. Receiver operator characteristics curve analysis showed a higher discriminatory ability of 24-h average aortic than brachial SBP to detect the presence of LVH (area under the curve: 0.73 versus 0.69; P\u200a=\u200a0.007). A high degree of interindividual overlap regarding aortic 24-h average SBP level was found in individuals in whom the corresponding brachial measurements denoted different hypertension levels.'] Is left-ventricular hypertrophy associated better with 24-h aortic pressure than 24-h brachial pressure in hypertensive patients : the SAFAR study?