Content of RRTOE. X-axis = Topics covered in RRTOE. Y-axis = Number of renal units including this topic in their programme. Size of bubbles and numbers within = Median percentage of time (%) spent on this topic in centres including it in their RRTOE. CKD = chronic kidney disease; HD = haemodialysis; PD = peritoneal dialysis; APD = automated PD; CAPD = continuous ambulatory PD.