Table 4 Spearman rank correlation coefficients between balance accelerometry conditions and the Short Physical Performance Battery balance (SPPB_b) and total (SPPB_t) scores, Gait Efficacy Scale (GES), Figure of 8 Walk Test (F8WT), Six-Minute Walk Test (6MWT), and gait speed (N = 131)

AP RMS

Level EO

−0.17*

− 0.24**

− 0.10

0.07

− 0.08

− 0.07

Level EC

− 0.30**

− 0.24**

− 0.19*

0.09

− 0.06

− 0.10

Foam EO

− 0.35**

− 0.33**

− 0.26**

0.21*

− 0.24**

− 0.22*

Foam EC

− 0.24**

− 0.08

− 0.03

− 0.11

0.10

0.11

Semi-tandem

−0.29**

− 0.26**

− 0.28**

0.02

− 0.09

−0.06

Feet tandem

−0.33**

− 0.28**

− 0.25**

0.22*

− 0.08

− 0.05

ML RMS

Level EO

−0.40**

− 0.27**

− 0.15

0.12

− 0.12

− 0.24**

Level EC

− 0.31**

− 0.15

− 0.15

0.02

− 0.01

− 0.10

Foam EO

− 0.39**

− 0.32**

− 0.31**

0.23**

− 0.27**

− 0.28**

Foam EC

− 0.15

− 0.04

− 0.09

−0.11

0.13

0.08

Semi-tandem

−0.43**

− 0.30**

− 0.26**

0.20*

− 0.22*

−0.25**

Feet tandem

−0.44**

− 0.42**

− 0.30**

0.24**

− 0.20*

− 0.27**

AP NPL

Level EO

−0.32**

− 0.30**

− 0.32**

0.27**

− 0.19*

− 0.24**

Level EC

− 0.30**

− 0.25**

− 0.22*

0.15

− 0.10

− 0.12

Foam EO

− 0.34**

− 0.35**

− 0.31**

0.21*

− 0.23**

− 0.20*

Foam EC

− 0.19*

− 0.08

− 0.08

−0.08

0.12

0.10

Semi-tandem

−0.28**

−0.32**

− 0.41**

0.31**

− 0.27**

− 0.19*

Feet tandem

−0.34**

− 0.37**

− 0.30**

0.27**

− 0.14

− 0.17

ML NPL

Level EO

− 0.33**

− 0.11

− 0.17

0.08

− 0.02

− 0.12

Level EC

−0.28**

− 0.06

− 0.12

0.01

0.05

−0.04

Foam EO

− 0.35**

− 0.27**

− 0.27**

0.21*

− 0.20*

− 0.21*

Foam EC

− 0.14

0.01

0.01

−0.16

0.20*

0.14

Semi-tandem

−0.36**

−0.25**

− 0.18*

0.18*

− 0.03

−0.13

Feet tandem

−0.25**

−0.29**

− 0.29**

0.27**

− 0.18*

−0.24**

22/24

17/24

15/24

12/24

10/24

10/24