Table 2.

Linear mixed-effects model investigating the effect of movement scores in the asocial trial ((a) median speed, (b) variance in speed and (c) turning speed), group size (as a categorical variable) and body size, on movement score in the social trial. Individuals are consistent in their median speeds and median turning speeds between contexts, but not their variance in speed. Significant p-values at the 0.05 level are shown in bold.

fixed effect	value	s.e.	d.f.	t-value	p-value
(a) median speed (mm s−1)
intercept	59.140	5.460
individual	0.062	0.028	130	2.210	0.029
group size = 4	−0.359	4.778	33	−0.075	0.941
group size = 8	6.059	4.755	33	1.274	0.211
body size	−0.642	0.705	130	−0.910	0.364
(b) variance in speed (mm2 s−2)
intercept	1541.963	229.261
individual	0.069	0.042	130	1.655	0.100
group size = 4	−120.140	160.507	33	−0.749	0.460
group size = 8	14.820	158.844	33	0.093	0.926
body size	46.130	33.790	130	1.365	0.175
(c) median turning speed (rad s−1)
intercept	1.129	0.082
individual	0.144	0.028	130	5.117	<0.001
group size = 4	0.001	0.063	33	0.021	0.983
group size = 8	0.080	0.063	33	1.277	0.211
body size	−0.065	0.011	130	−5.719	<0.001