. Author manuscript; available in PMC: 2015 Aug 4.

Published in final edited form as: Curr Biol. 2014 Jul 24;24(15):1806–1810. doi: 10.1016/j.cub.2014.06.058

Table 1.

Results of the linear mixed model examining the probability that a subject looks towards the kin image of a pair (final model).

Predictor variable	Estimate	SE	χ ²	df	p
Intercept	0.446	0.037

Subject sex (female = 0, male = 1)	0.074	0.045
Image sex (female = 0, male = 1)	0.079	0.051
Subject age	0.035	0.018	3.220	1	0.073
Side kin presented⁽¹⁾	−0.035	0.032	1.106	1	0.293

Subject sex (male) : Image sex (male)	−0.200	0.063	9.256	1	0.002

⁽¹⁾

Side presented was dummy coded and centered, with side on which the non-kin image was presented being the reference category.