Table 2 Travel linearity and speed models: comparison between the Mbendjele people and Taï chimpanzees.

Effect	Estimate	SE	CL_lower	CL_upper	χ²	df	P
A. Final linearity model with group size
(Intercept)	1.332	0.066	1.197	1.467			*
Seasonal familiarity¹	0.248	0.123	0.012	0.495			*
Species (human)	−0.174	0.036	−0.249	−0.100			*
Group size²	−0.140	0.071	−0.250	−0.024			*
Straight line distance³	−0.174	0.045	−0.266	−0.089	11.507	1	<0.001
Female ratio⁴	−0.134	0.053	−0.233	−0.030	6.577	1	0.011
Arrival ___location type (food-inspection ___location)⁵	0.096	0.075	−0.048	0.237	2.160	2	0.201
Arrival ___location type (trail)⁵	0.134	0.153	−0.142	0.427			*
Species (human): Seasonal familiarity	0.304	0.074	0.157	0.452	17.019	1	<0.001
Species (human): Group size	0.296	0.094	0.123	0.477	9.897	1	0.002
B. Final travel speed model
(Intercept)	0.394	0.028	0.338	0.450			*
Seasonal familiarity¹	−0.053	0.010	−0.072	−0.033			*
Species (human)	−0.062	0.032	−0.129	0.004			*
Group size²	−0.004	0.009	−0.021	0.013	0.178	1	0.673
Straight line distance³	0.037	0.009	0.019	0.055	9.066	1	0.003
Female ratio⁴	−0.006	0.009	−0.024	0.011	0.449	1	0.503
Arrival ___location type (non-ephemeral food)⁶	0.005	0.022	−0.039	0.047	0.329	2	0.848
Arrival ___location type (trail)⁶	0.018	0.031	−0.047	0.079			*
Maximum age⁷	0.011	0.010	−0.009	0.032	1.096	1	0.295
Species (human): Seasonal familiarity	0.045	0.019	0.006	0.082	4.431	1	0.035

Statistically significant results appear in bold. CL: confidence limit.
See Supplementary Table S2, S4 for the results of full and intermediate models and Table S3 for the linearity model 2 with max age.
*Not shown due to having a very limited interpretation.
^1,2,3,7Log- and then z-transformed; mean ± SD of log-transformed values: ¹5.01 ± 1.04, ²1.07 ± 0.79, ³4.50 ± 0.80, ⁷3.67 ± 0.20.
⁴Z-transformed; mean ± SD of the original values: 0.78 ± 0.26.
^5,6Arrival ___location type was dummy coded with the reference category: ⁵food-collection ___location, ⁶ephemeral food site.

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