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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: Anim Behav. 2017 Jul 22;130:199–207. doi: 10.1016/j.anbehav.2017.06.019

Table 1.

Factors influencing propensity to look up in test trials

Factor Estimate SE Z P
Condition order (control first = reference) −0.434   0.298 −1.455   0.14
Session half (1–2) −0.358   0.277 −1.295   0.19
Species (Barbary = reference)   2.141   0.765   2.798 <0.01
Age: Barbary −0.027   0.033 −0.824   0.87
Age: Rhesus −0.240   0.061 −3.944 <0.001
Sex: Barbary (female = reference)   0.095   0.401   0.237   0.99
Sex: Rhesus (female = reference) −1.609   0.486 −3.309 <0.005

Predictors from the full (best-fit) model. Condition order, session half and a random subject factor were included across models. Species and the interactions between species*age and species*sex were added to successive models to test their importance. Significant P values are shown in bold.