Table 2.

Regression analyses to test the mediator effect of PG on floral symmetry prediction of CV of flower size. CI, confidence interval; floral symmetry (0, bilateral; 1, radial); n.s., not significant.

predictor variable	B	s.e.	95% CI	β	t	criterion variable
all species included
step 1
floral symmetry	0.128	0.041	0.044, 0.212	0.530	3.128**	CV of flower size
step 2
floral symmetry	0.665	0.264	0.122, 1.208	0.451	2.524*	PG
step 3
PG	0.077	0.027	0.021, 0.134	0.474	2.822**	CV of flower size
floral symmetry	0.076	0.040	−0.007, 0.160	0.317	1.885 (n.s.)	CV of flower size
two species excluded
step 1
floral symmetry	0.110	0.040	0.028, 0.192	0.502	2.786*	CV of flower size
step 2
floral symmetry	0.675	0.262	0.134, 1.216	0.474	2.581*	PG
step 3
PG	0.067	0.029	0.006, 0.127	0.432	2.295*	CV of flower size
floral symmetry	0.065	0.041	−0.020, 0.151	0.298	1.584 (n.s.)	CV of flower size

*p < 0.05, **p < 0.01.