Table 1. Statistics for number of food items taken.

	ß	S.E.	Wald	df	P	Exp(ß)
O. glaber vs. M. antarcticum	0.39	0.10	15.77	1	0.001 **	1.47
T. jocosus vs. M. antarcticum	1.68	0.13	178.27	1	0.001 **	5.35
0.01 µg/µl vs. Control	−0.79	0.17	22.91	1	0.001 **	0.45
1 µg/µl vs. Control	−1.65	0.15	113.94	1	0.001 **	0.19
100 µg/µl vs. Control	−2.16	0.15	201.34	1	0.001 **	0.12
Constant	2.11	0.14	226.75	1	0.001 **	8.23

* P<0.05;

** P<0.01.

Logistic regression on the number of food items taken in trials by Argentine ants versus M. antarcticum, O. glaber and T. jocosus. First two rows show the difference between food items taken by Argentine ants from a species, with M. antarcticum as reference. The next three rows show the difference of food items taken by Argentine ants depending on pheromone concentration with the control treatment as a reference. ß is the log-odds units, S.E. the standard errors associated with the coefficients, Wald the Wald chi-square value, df the degrees of freedom, P the statistical significance and Exp(ß) the odds ratio.