Baseline medullary and cortical R2*values and medullary cortical ratio's (MCR), overall and by gender.

All values are shown before and after the administration of intravenous furosemide. Subjects on loop diuretics (n = 2 in the AHT group and n = 15 in the CKD group) are not included in the furosemide-induced changes. Values expressed in sec−1, as mean±SD or as median (25th–75th percentile), as appropriate. CKD = chronic kidney disease; AHT = arterial hypertension. * P<0.05 concerning within-group differences between men and women.