Table 1.

Demographics of control and study groups.

	Control n (%)	Study n (%)	P
Cases	653	5
Age, y	28	26	.51
Men	535 (82)	3 (60)	.22
Women	118 (18)	2 (40)
Active duty military	562 (86)	3 (60)	.15
Other	91 (14)	2 (40)
American Society of Anesthesiologists
Class 1	398 (61)	4 (80)	.65
Class 2	255 (39)	1 (20)
Length of surgery (min)	169.8	185.0	.50