2.3. Study protocol

Study participants were examined at the Department of Pediatric Clinical Physiology at The Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg. All measurements (i.e., anthropometric data collection, blood pressure and ⁵¹Cr‐EDTA clearance) were performed during the same study visit by the same research nurse throughout the study. Blood pressure was measured with Medidyne (WelchAllyn, Mississauga, Canada) and the measurements were performed in the right upper arm in a sitting position after 5 min of rest. Three consecutive measurements were performed, and the mean systolic versus the mean diastolic blood pressures were recorded. Elevated office ambulatory blood pressure was confirmed with 24‐h ambulatory blood pressure monitoring. High blood pressure was defined as an increased mean blood pressure according to the Clinical Practice Guideline for Screening and Management of High Blood Pressure in Children and Adolescents. ¹⁷