Table 2.

Results of Model 1, in which the dependent variable was the selection of SR in ExpSR trials.

Test Category	χ 2	Df	P
Species	16.67	5	0.005
Session	33.30	1	<0.001
Subject’s sex	0.27	1	0.604
Subject’s age class	1.65	2	0.438
Partner’s position	1.28	1	0.257
Performance in Preference phase	0.93	1	0.334
Trial number	29.91	1	<0.001

Significant results in bold. See text for details on the test and control predictors.