Table 1.

Effect of treatment on survivorship

Treatment	Survival	χ2*	P value
Virgins
M vs. S males	M > S	213.3	<0.001
M vs. S females	S > M	6.5	0.011
Within-treatment mixed sex
M vs. S males	M > S	38.0	<0.0001
M vs. S females	M > S	30.5	<0.0001
Cross-treatment mixed sex
Mi vs. Si males (with Mj females)	M > S	28.1	<0.0001
Mi vs. Si females (with Mj males)	M > S	52.2	<0.0001
Mi vs. Si males (with Sj females)	M = S	0.01	0.9
Mi vs. Si females (with Sj males)	M = S	0.2	0.7

^*Based on a Mantel–Cox survival test (34), with 1 df. See details in text.