TABLE A3.

Effects of competition (present/absent) and competitor sex (male/female) on male ejaculate mass (mg)

Terms	Estimate	SE	df	F	p
Not controlling for male weight
Fixed effects
Intercept	0.204	0.013	1,73.1	554.9	<.001
Competition (no)	0.016	0.018	1,95.4	2.474	.119
Within competition treatment effects
Competitor sex (male)	−0.011	0.016	1,83.1	0.526	.471
Random effects	Variance	SE
Bean ID	0.001	0.001
Residual	0.003	0.001
Controlling for male weight
Fixed effects
Intercept	−0.001	0.057	1,73.0	0.007	.933
Competition (no)	0.015	0.015	1,95.2	2.104	.150
Male weight	0.055	0.015	1,99.0	13.570	<.001
Within competition treatment effects
Competitor sex (male)	−0.891	1.476	1,83.2	0.365	.547
Random effects	Variance	SE
Bean ID	0.001	0.001
Residual	0.003	0.001

We ran models twice – first without including focal male weight (“Not controlling for male weight) and then with focal male weight (“Controlling for male weight”). Results are from mixed models fitted in ASReml‐R. Factors related to characteristics of competitors were fit as conditional effects. F statistics are conditional and taken from Wald's test. p‐values < .05 are shown in bold. Shaded rows show the effects of primary interest.