Table 1

Demographics.

	Group B	Group A	p
Total number	n = 700	n = 30	NA
Mean age at operation date	41 ± 9 (range 18-64)	40 ± 9 (range 21-54)	0.81
Women	n = 354	n = 12	0.25
Men	n = 346	n = 18	0.25
Preoperative smoking (percentage of group)	n = 67 (9.5%)	n = 4 (13%)	0.47

Demographics of the included patients. P-values describe intergroup differences. Abbreviations: n = numerical value; NA = not applicable.