. 2022 May 3;10:e13403. doi: 10.7717/peerj.13403

Table 5. Regression models in which the dependent variables are the foot structure indices.

Excess of footwear [mm]		R	R ²	$R_{adj}^{2}$	F	p	b	r _p	p
Clarke’s angle [°] of the right foot
Girls	Length	0.56	0.31	0.29	10.79	<0.001^*	−2.68	−0.71	<0.001^*
Girls	Width	0.56	0.31	0.29	10.79	<0.001^*	−0.11	−0.24	0.012^*
Boys	Length	0.78	0.61	0.59	36.17	<0.001^*	−3.35	−0.53	<0.001^*
Boys	Width	0.78	0.61	0.59	36.17	<0.001^*	−2.06	−0.02	0.906
Clarke’s angle [°] of the left foot
Girls	Length	0.43	0.18	0.15	5.20	0.009^*	−1.54	−0.32	0.028^*
Girls	Width	0.43	0.18	0.15	5.20	0.009^*	−1.27	−0.18	0.224
Boys	Length	0.77	0.60	0.58	35.01	<0.001^*	−3.32	−0.75	<0.001^*
Boys	Width	0.77	0.60	0.58	35.01	<0.001^*	−1.71	−0.30	0.034^*
Heel angle (γ) [°] of the right foot
Girls	Length	0.68	0.50	0.44	19.95	<0.001^*	−0.38	−0.48	<0.001^*
Girls	Width	0.68	0.50	0.44	19.95	<0.001^*	0.92	0.66	<0.001^*
Boys	Length	0.78	0.61	0.59	36.25	<0.001^*	−0.18	−0.35	0.013^*
Boys	Width	0.78	0.61	0.59	36.25	<0.001^*	1.06	0.77	<0.001^*
Heel angle (γ) [°] of the left foot
Girls	Length	0.71	0.51	0.49	24.32	<0.001^*	−0.34	−0.45	0.001^*
Girls	Width	0.71	0.51	0.49	24.32	<0.001^*	1.02	0.71	<0.001^*
Boys	Length	0.70	0.49	0.47	22.74	<0.001^*	−0.03	−0.05	0.710
Boys	Width	0.70	0.49	0.47	22.74	<0.001^*	1.02	0.70	<0.001^*
Hallux valgus angle (α) [°] of the right foot
Girls	Length	0.05	0.00	−0.04	0.07	0.937	−0.05	−0.03	0.822
Girls	Width	0.05	0.00	−0.04	0.07	0.937	−0.06	−0.03	0.858
Boys	Length	0.21	0.04	0.00	1.04	0.361	−0.28	−0.17	0.216
Boys	Width	0.21	0.04	0.00	1.04	0.361	0.34	0.12	0.401
Hallux valgus angle (α) [°] of the left foot
Girls	Length	0.10	0.01	−0.03	0.23	0.788	−0.14	−0.09	0.560
Girls	Width	0.10	0.01	−0.03	0.23	0.788	0.21	0.08	0.577
Boys	Length	0.16	0.02	−0.02	0.58	0.559	−0.22	−0.15	0.284
Boys	Width	0.16	0.02	−0.02	0.58	0.559	0.00	0.00	0.993
The angle of the varus deformity of the Vth toe (β) [°] of the right foot
Girls	Length	0.08	0.01	−0.03	0.17	0.847	−0.23	−0.08	0.570
Girls	Width	0.08	0.01	−0.03	0.17	0.847	0.17	0.04	0.777
Boys	Length	0.18	0.03	−0.01	0.81	0.448	0.41	0.17	0.236
Boys	Width	0.18	0.03	−0.01	0.81	0.448	−0.35	−0.08	0.573
The angle of the varus deformity of the Vth toe (β) [°] of the left foot
Girls	Length	0.20	0.04	−0.00	0.98	0.381	−0.24	−0.11	0.449
Girls	Width	0.20	0.04	−0.00	0.98	0.381	0.67	0.20	0.174
Boys	Length	0.10	0.01	−0.03	0.23	0.797	0.20	0.09	0.526
Boys	Width	0.10	0.01	−0.03	0.23	0.797	0.10	0.02	0.867

Notes.

R: coefficient of multiple correlation
R²: coefficient of determination
$R_{adj}^{2}$: adjusted R²
F: value of the Fisher-Snedecor test statistic
b: coefficient of slope of the regression line
r_p: partial correlation
p: probability value

α = 0.05.