Table 2.

Patient data from laminar and non-laminar flow theatres

	Non-laminar flow	Laminar flow	P-value
Total	114	56
Sex (M:F)	76:38	33:23	0.323*
Mean age (range)	64.8 (19–87)	69.1 (19–90)	0.06 ‡
Mean operative time (range) in minutes	85.1 (20–350)	95.5 (20–225)	0.263 ‡
‘Re-do’ procedures	8 (7%)	4 (7%)	1.0 †
Arterial procedures	92 (81%)	51 (91%)	0.102*
Arterial grafts used	46 (40%)	35 (63%)	0.007*
Groin incision	50 (44%)	22 (39%)	0.539*
Antibiotic prophylaxis given	93 (82%)	50 (89%)	0.283*
Diabetes mellitus	15 (13%)	4 (7%)	0.306 †
Ischaemic heart disease	36 (32%)	13 (23%)	0.258*
Chronic obstructive pulmonary disease	18 (16%)	9 (16%)	0.962*
Surgical site infections	19 (17%)	4 (7%)	0.1 †

^*chi-square test;

^†Fisher’s exact test;

^‡Student’s t-test