Table 2.

Effects of personality, environment and sex on acoustic signalling in pigs, Sus scrofa domestica. Linear mixed effects model for acoustic signalling rate (n = 68).

variable	estimate	s.e.	t-value	p-value
intercept	0.418	0.260	1.607	0.113
PR index (personality)	0.531	0.110	4.822	<0.001
environment	−0.277	0.244	−1.130	0.263
sex	−0.732	0.243	−3.017	0.037
environment : sex	0.708	0.330	2.147	0.036