Table 2 Descriptive statistics for predictor variables. Most values reported as mean ± standard deviation (25^th, 75^th percentile), with exceptions noted below

Anthropometrics, and descriptors of knee osteoarthritis

Foot posture index (-12 to + 12)

5 (2,8)

Numerical rating scale knee pain (0 to 10)

4.4 ± 2.1 (3.0, 6.0)

Foot Function Index pain score (25% to 100%)

43.3 ± 17.0 (30.0, 50.0)

Kellgren and Lawrence grade (KL2—KL3—KL4)

27 – 22 – 4

Gait, posture, and movement characteristics

Clinically-Accessible

Laboratory-Derived

Gait speed (dm/s)

11.9 ± 1.8 (10.9, 13.2)

11.8 ± 1.8 (10.7, 12.9)

Ankle/Subtalar eversion motion ( °)

8.8 ± 3.9 (6.0, 11.3)

7.0 ± 2.7 (5.6, 8.2)

Foot progression angle ( °)^a

-9.5 ± 6.0 (-12.0, -6.0)

-10.9 ± 6.8 (-13.6, -6.3)

Frontal plane tibial/knee angle ( °)^a

-1.1 ± 3.5 (-3.3, 0.7)

-2.0 ± 5.0 (-4.6, 1.9)