Table 5 Coefficient, p-value and pseudo-R2 after univariate quantile regression to predict the Goodman A score

Age

0 (-0.32 to 0.32)

0.999

0.001

Male

-6.25 (-11.94 to -0.56)

0.030*

0.001

WOMAC-pain

-2.84 (–3.33 to -2.36)

 < 0.000*

0.260

WOMAC-Stiffness

-6.25 (-7.43 to -5.07)

 < 0.000*

0.240

WOMAC-Function

-0.80 (-0.95 to 105.03)

 < 0.000*

0.240

Kujala

0.42 (0.26 to 0.59)

 < 0.000*

0.200

KOOS QL

0.22 (0.12 to 0.32)

 < 0.000*

0.180

Anterior knee pain

-12.5 (-20.6 to -4.41)

0.003*

0.060

Follow-up

-0.70 (-2.51 to 1.11)

0.444

0.010

ROM

0 (-0.21 to 0.21)

0.999

0.001

Extension

0 (-0.61 to 0.61)

0.999

0.001

Extension difference

0 (-0.61 to 0.61)

0.999

0.001

Flexion

0 (-0.25 to 0.25)

0.999

0.001

Flexion difference

0 (-0.24 to 0.24)

0.999

0.001

BMI at FU

0 (-0.59 to 0.59)

0.999

0.001

Up and Go test

-0.64 (-1.32 to 0.05)

0.070

0.020

Situp test

0 (-0.81 to 0.81)

0.999

0.001

Muscular force

0 (-0.03 to 0.03)

0.999

0.001

Algometry

0.32 (-0.12 to 0.77)

0.150

0.002