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Table 3 Cut-off values for NH, FL and LAA

From: Classification of the height and flexibility of the medial longitudinal arch of the foot

Maximum values

n = 254

Test

Severely low arch

Low arch

Normal

High arch

Severely high arch

NH (cm)

< 2.7

2.7 to 3.5

3.6 to 5.5

5.6 to 6.4

> 6.4

FL (cm)

< -3.3

-3.3 to -2.5

-2.6 to -1.2

-1.3 to -0.4

> -0.4

LAA (°)

< 121

121 to 130

131 to 152

153 to 162

> 162

Range of motion values

n = 254

Test

Very flexible

Flexible

Normal

Rigid

Very rigid

ND (cm)

> 2.3

2.3 to 1.8

1.8 to 0.6

0.6 to 0.0

< 0.0

FL (cm)

> 1.3

1.3 to 0.9

0.9 to -0.1

-0.1 to -0.6

< -0.6

LAA (°)

> 19

19 to 13

13 to -1

-1 to -7

< -7

  1. Cut-off values of the medial longitudinal arch maximum values and range of motion values without taking into account the association between the variables included in the regression models with NH, FL, and LAA. In relation to maximum values and range of motion values, the normal categories were defined by the 68% prediction limit cut-offs. Low arch and high arched feet as well as flexible and rigid feet were categorized based on the 95% prediction limit cut-offs. NH: navicular height; FL: Feiss line; LAA: Longitudinal arch angle