Validity of a simple footprint assessment board for diagnosing the severity of flatfoot: a prospective cohort study

Table 3 Tibiocalcaneal angle. Regression analysis with the value of the simple footprint assessment board as a dummy variable

Score of arch check board	n	Mean navicular index	Regression factor	Standard error	t-value	P-value	Coefficient of determination	Adjusted coefficient of determination
(Intercept)			26.000	1.232	21.107	0.000	0.876	0.838
Score 0.5 (Reference)	2	6.4
Score 1	5	6.0	−5.940	1.458	−4.075	0.000
Score 1.5	5	5.2	−10.440	1.458	−7.163	0.000
Score 2	9	4.4	−10.917	1.422	−7.675	0.000
Score 2.5	6	4.5	−12.520	1.458	−8.590	0.000
Score 3	6	3.9	−13.900	1.422	−9.772	0.000
Score 3.5	1	3.7	−16.300	2.134	−7.640	0.000
Score 4	1	3.0	−17.000	2.134	−7.968	0.000
Score of arch check board	Regression factor		Standard error	t-value	P-value	Coefficient of determination	Adjusted coefficient of determination
(Intercept)	24.064		0.977	24.630	0.000	0.760	0.752
Score	−4.200		0.438	−9.590	0.000

Score of arch check board (explanatory variables: x)
Tibiocalcaneal angle (objective variables: y)
Regression analysis with the value of the simple footprint assessment board as a continuous variable
Score of arch check board (explanatory variables: x)
Tibiocalcaneal angle (objective variables: y),

ISSN: 1471-2474