Table 1

Essential and desirable patient-level covariates for meta-analysis identified a priori

	Study	Thomas et al 38 73	Clark and Powell39	Aboyans et al 40	Agarwal et al 41	Clark et al 42	Clark et al 43	Kim et al 29	Sheng et al 32	Durrand et al 44	White et al 45	Clark et al 31	Weinberg et al 46
Suggested essential minimum dataset for analyses	Age	X	X	X	X	X	X	X	X	X	X	X	X
	Gender	X	X	X	X	X	X	X	X	X	X	X	X
	BMI	X	X	X	X	X		X	X		X	X	X
	Smoking	X	X	X	X	X	X	X	X		X	X	X
	Systolic BP	X	X	X	X	X	X		X		X	X	X
	Diastolic BP	X	X		X	X	X		X		X	X	X
	Hypertensive Yes/no	X	X	X	X	X		X	X	X	X	X	X
	Lipids (total and HDL)	X	X	X		X	X	X	X		X	X	X
	Diabetic Yes/no	X		X	X	X	X	X	X	X	X	X	X
Desirable further data for sensitivity analyses	HbA1c	X										X
	Chronic Kidney Disease (CKD) Yes/no	X			X					X		X
	Presence of CKD, record of estimated glomerular filtration rate or creatine	X			X			X (creatine)				X
	Ankle–brachial index			X			X		X		X
	Framingham score					X							X
	Ethnic grouping	X	X	X		X	X	X	X		X	X	X