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Table 4.

Select results from partial correlation analysis and simple linear regressions^{^†}correlating absolute dependent variables (dep. var.) with basilisk mass as the independent variable

Dependent variables	p1	p2	r²_mass	p3	p4	r²_velocity	r²_{mass×velocity}	P
ΔX_knee(cm)^{^†}	12.46	0.09	0.197	13.30	0.79	0.505	0.344	0.075
ΔY_knee(cm)^{^*}	2.09	0.27	0.842	4.96	—0.02	0.000	0.844	<0.001
ΔZ_knee(cm)^{^*}	0.90	0.35	0.799	3.07	—0.42	0.073	0.887	<0.001
ΔX_ankle(cm)^{^†}	12.53	0.09	0.186	13.20	0.84	0.525	0.336	0.081
ΔY_ankle(cm)^{^*}	2.13	0.29	0.955	5.39	—0.09	0.005	0.968	<0.001
ΔZ_ankle(cm)^{^*}	2.31	0.08	0.133	2.45	0.62	0.333	0.173	<0.001
Y_hip,ff (cm)	3.06	—0.24	0.227	0.87	1.88	0.281	0.349	0.072
Y_hip,min(cm)^{^*}	3.37	—0.40	0.431	0.43	2.82	0.249	0.615	0.007
eLL_slap(cm)^{^†}	2.45	0.13	0.370	3.43	0.22	0.047	0.377	0.059
eLL_stroke(cm)^{^*}	2.00	0.32	0.922	5.70	—0.12	0.007	0.938	<0.001
Stride length(cm)^{^†}	12.96	0.09	0.168	13.39	0.84	0.542	0.311	0.094
Stride duration(s)^{^†}	0.10	0.10	0.383	0.13	—0.04	0.003	0.388	0.055
Df_stance^{^*},^{^†}	0.22	0.11	0.500	0.34	—0.31	0.203	0.665	0.004
Df_sub^{^*},^{^†}	0.47	0.09	0.612	0.65	—0.18	0.107	0.713	0.004
U_X,slap (m s^-1)	0.20	0.04	0.002	0.22	0.03	0.000	0.002	0.900
U_X,stroke (m s^-1)^{^*},^{^†}	—0.02	0.74	0.424	—0.34	—1.01	0.068	0.472	0.028
U_Y,slap (m s^-1)^{^*},^{^†}	—0.65	0.26	0.548	—1.53	—0.19	0.016	0.567	0.012
U_Y,stroke(m s^-1)^{^*},^{^†}	—0.16	0.45	0.767	—0.77	—0.60	0.091	0.872	<0.001
Knee extension(deg.)^{^*},^{^†}	34.21	0.24	0.567	83.69	—0.54	0.179	0.727	0.001
Ankle extension (deg.)	30.17	0.24	0.184	85.83	—1.19	0.381	0.337	0.078
θ_knee,ff(deg.)^{^*},^{^†}	137.37	—0.20	0.691	75.72	0.08	0.004	0.700	0.003
θ_knee,es(deg.)^{^†}	173.61	—0.06	0.311	144.88	—0.02	0.002	0.310	0.094
θ_ankle,ff (deg.)	109.59	—0.12	0.261	67.53	0.47	0.129	0.319	0.088
θ_ankle,es (deg.)	140.23	—0.01	0.005	145.91	—0.30	0.14	0.003	0.869
% Slap	0.12	0.03	0.015	0.12	0.32	0.079	0.013	0.750
%Stroke^{^*},^{^†}	0.11	0.18	0.320	0.22	—0.66	0.277	0.481	0.026
% Recovery up	0.48	0.01	0.024	0.50	0.02	0.004	0.23	0.672
% Recovery down^{^*},^{^†}	0.33	—0.19	0.389	0.16	0.60	0.122	0.466	0.030

Dependent variables	p1	p2	r²_mass	p3	p4	r²_velocity	r²_{mass×velocity}	P
ΔX_knee(cm)^{^†}	12.46	0.09	0.197	13.30	0.79	0.505	0.344	0.075
ΔY_knee(cm)^{^*}	2.09	0.27	0.842	4.96	—0.02	0.000	0.844	<0.001
ΔZ_knee(cm)^{^*}	0.90	0.35	0.799	3.07	—0.42	0.073	0.887	<0.001
ΔX_ankle(cm)^{^†}	12.53	0.09	0.186	13.20	0.84	0.525	0.336	0.081
ΔY_ankle(cm)^{^*}	2.13	0.29	0.955	5.39	—0.09	0.005	0.968	<0.001
ΔZ_ankle(cm)^{^*}	2.31	0.08	0.133	2.45	0.62	0.333	0.173	<0.001
Y_hip,ff (cm)	3.06	—0.24	0.227	0.87	1.88	0.281	0.349	0.072
Y_hip,min(cm)^{^*}	3.37	—0.40	0.431	0.43	2.82	0.249	0.615	0.007
eLL_slap(cm)^{^†}	2.45	0.13	0.370	3.43	0.22	0.047	0.377	0.059
eLL_stroke(cm)^{^*}	2.00	0.32	0.922	5.70	—0.12	0.007	0.938	<0.001
Stride length(cm)^{^†}	12.96	0.09	0.168	13.39	0.84	0.542	0.311	0.094
Stride duration(s)^{^†}	0.10	0.10	0.383	0.13	—0.04	0.003	0.388	0.055
Df_stance^{^*},^{^†}	0.22	0.11	0.500	0.34	—0.31	0.203	0.665	0.004
Df_sub^{^*},^{^†}	0.47	0.09	0.612	0.65	—0.18	0.107	0.713	0.004
U_X,slap (m s^-1)	0.20	0.04	0.002	0.22	0.03	0.000	0.002	0.900
U_X,stroke (m s^-1)^{^*},^{^†}	—0.02	0.74	0.424	—0.34	—1.01	0.068	0.472	0.028
U_Y,slap (m s^-1)^{^*},^{^†}	—0.65	0.26	0.548	—1.53	—0.19	0.016	0.567	0.012
U_Y,stroke(m s^-1)^{^*},^{^†}	—0.16	0.45	0.767	—0.77	—0.60	0.091	0.872	<0.001
Knee extension(deg.)^{^*},^{^†}	34.21	0.24	0.567	83.69	—0.54	0.179	0.727	0.001
Ankle extension (deg.)	30.17	0.24	0.184	85.83	—1.19	0.381	0.337	0.078
θ_knee,ff(deg.)^{^*},^{^†}	137.37	—0.20	0.691	75.72	0.08	0.004	0.700	0.003
θ_knee,es(deg.)^{^†}	173.61	—0.06	0.311	144.88	—0.02	0.002	0.310	0.094
θ_ankle,ff (deg.)	109.59	—0.12	0.261	67.53	0.47	0.129	0.319	0.088
θ_ankle,es (deg.)	140.23	—0.01	0.005	145.91	—0.30	0.14	0.003	0.869
% Slap	0.12	0.03	0.015	0.12	0.32	0.079	0.013	0.750
%Stroke^{^*},^{^†}	0.11	0.18	0.320	0.22	—0.66	0.277	0.481	0.026
% Recovery up	0.48	0.01	0.024	0.50	0.02	0.004	0.23	0.672
% Recovery down^{^*},^{^†}	0.33	—0.19	0.389	0.16	0.60	0.122	0.466	0.030

Variables were fitted to the following two nonlinear, exponential functions: dep. var. = p1 ×(mass^p₂) and dep. var. = p3× (velocity^p₄). Unknown parameters (p1, p2, p3 and p4) were determined by Gauss—Newton estimations.

Abbreviations are presented as described in the text and List of symbols:ff, footfall; es, end of stance.

P-values were determined with two-tailed t-tests

N=11, except Df_sub, which was N=10.

indicates significance of P<0.05

†

Indicates a significant simple linear regression of dependent variable against mass. All linear variables were adjusted by snout—vent length(SVL) and leg length (LL) (P<0.05)

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