1. Number of cases lost to follow up.

Study	Total patients	Total operations	Patch lost at 30 days	Patch lost at end	Primary lost at 30 days	Primary lost at end	Number of exclusions	Crossover patch ‐ non	Crossover non ‐ patch
AbuRahma 1996	357	399	0	0	0	0	4	0	0
Al‐Rawi 2006l	315	338	0	7	0	8	10	Data not available	Data not available
Eikelboom 1988	126	129	0	10 patients lost to doppler FU but not clinical FU	0	7 to doppler FU but not clinical FU	0	3	3
Katz 1994	87	100	0	5	0	7	0	0	0
Lord 1989	123	140	0	0	0	0	4	Between 0 and 4	Between 0 and 4
Mannheim 2005	404	422	0	Data not available	0	Data not available	Data not available	0	0
Myers 1994	136 (109 after exclusion of 27 patients undergoing obligatory vein patching)	152 (122 analysed as 30 operations got obligatory vein patches)	0	6	0	8	30 operations underwent obligatory vein patch closure and 16 patients had both sides done (total 46)	0	0
Pratesi 1986	100	100	Data not available	Data not available	Data not available	Data not available	Data not available	Data not available	Data not available
Ranaboldo 1993	199	213	0	5	0	12	0	0	0 at 30‐day FU but 4 at 1‐year FU
Vleeschauwer 1987	126	174	0	Data not available	0	Data not available	0	0	0

FU: follow up