Baseline demographic and clinical data for patients.

Figures in brackets are standard deviation of the mean or % of total in treatment group. ADPKD – autosomal dominant polycystic kidney disease. BP = blood pressure, ACE-I angiotensin converting enzyme inhibitor, ARB – angiotensin receptor blocker, MAP = mean arterial pressure, aPWV = aortic pulse wave velocity, LVMI – left ventricular mass index, AF – auto fluorescence, FCD – functional capillary density, MFI – microvascular flow index. AU – arbitrary units #- any form of glyceryl trinitrate, isosorbide mononitrate, isosorbide dinitrate or other esters of nitric acid ∼- Additional causes of CKD in ergocalciferol group: tubulo-interstitial nephritis (n = 1), reflux nephropathy (n = 2), unknown (n = 2). Placebo group: reflux nephropathy (n = 2), ischaemic nephropathy presumed due to reno-vascular disease (n = 1), unknown (n = 2).