Table 4.

Parameters of prereferral management

Parameter	Operational definition	Scale of measurement
Use of RAAS inhibitors	Use of ACE inhibitors or ARBs	Y or N. If yes, details about drug, dosage, duration
Glycaemic control	Target HbA1c≤53 mmol/mol (7%)	Optimal versus suboptimal control
Use of vitamin D or calcium supplements	Participants taking vitamin D or calcium supplements at the time of enrolment	Y or N
BP at initial visit (systolic/diastolic)	BP recorded on first visit to the nephrology clinic with target <130/80 representing adequate control	Suboptimal versus optimal control
Body mass index (BMI)	BMI at enrolment, with obesity defined as BMI≥30	<30 or ≥30

ARB, angiotensin receptor blockers; BP, blood pressure; HbA1c, glycated haemoglobin; RAAS, renin angiotensin aldosterone system.