Inclusion Criteria:  All hypertensive and obstructive sleep apnea patients present in QregPV and SESAR 2008-2021.  Exclusion Criteria:  Patients in the hypertensive control group (without OSA) will be excluded if they have OSA diagnosis but are not present in the SESAR registry. Subjects with missing data on any of the variables in the fitted model unless the missing data can be accurately imputated. Patients with low life expectancy (Age>75 at study start, malignant disease). Patients no longer living in VGR 2021.