Table 6. Comparisons at equal forwarded log concentrations: the main effect of number of assortments in a load α and the covariate forwarded log concentration on the strip-road γ (m3ob (100 m)–1).
Dependent variable	ANCOVA			Regression analysis
	Term	F	p-value	Term	Estimate	Standard error	t-value	p-value	R2 (adj) (%)	n
Time consumption for a loading stop (PMmin)	α	6.31	<0.001	Constant	0.14468	1.020	7.38	<0.001	57.3	485
	γ	415.43	<0.001	γ	0.05248	0.003	20.38	<0.001
				α = 1	–0.04050	1.016	–2.58	0.010
				α = 2	–0.03166	0.022	–1.41	0.158
				α = 3	–0.01027	0.016	–0.64	0.522
Time consumption for driving while loading (PMmin (m3ob)–1)	α	0.64	0.600	Constant	0.07272	0.015	5.01	<0.001	99.3	24
	γ–1	2152.62	<0.001	γ–1	2.32958	0.050	46.40	<0.001
Ln(number of loading stops per load)	α	1.88	0.167	Constant	3.57126	0.051	70.46	<0.001	94.4	24
	γ	247.74	<0.001	γ	–0.09150	0.006	–15.74	<0.001
Number of loaded piles per stop	α	2.34	0.073	Constant	0.41048	0.056	7.33	<0.001	63.0	485
	γ	643.10	<0.001	γ	0.18669	0.007	25.36	<0.001
Number of crane cycles per loading stop	α	1.09	0.352	Constant	0.47902	0.050	9.53	<0.001	65.8	485
	γ	688.27	<0.001	γ	0.17325	0.001	26.23	<0.001
Significant values (p < 0.05, Eq. 2) in bold.