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

Table 2 Navicular index. 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)			6.370	0.479	13.299	0.000	0.658	0.569
Score 0.5 (Reference)	2	6.4
Score 1	5	6.0	−0.382	0.567	−0.674	0.506
Score 1.5	5	5.2	−1.200	0.567	−2.117	0.044
Score 2	9	4.4	−1.974	0.530	−3.729	0.001
Score 2.5	6	4.5	−1.905	0.553	−3.444	0.002
Score 3	6	3.9	−2.465	0.553	−4.457	0.000
Score 3.5	1	3.7	−2.670	0.830	−3.218	0.003
Score 4	1	3.0	−3.370	0.830	−4.062	0.000
Score of arch check board	Regression factor		Standard error		t-value	P-value	Coefficient of determination	Adjusted coefficient of determination
(Intercept)	6.505		0.277		23.470	0.000	0.602	0.590
Score	−0.883		0.125		−7.060	0.000

Score of arch check board (explanatory variables: x)
Navicular index (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)
Navicular index (objective variables: y),

ISSN: 1471-2474