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Table 2 Correlation between accelerometer measures and clinical measures (Spearmen coefficient)

From: Normative data on spontaneous stride velocity, stride length, and walking activity in a non-controlled environment

  

Age

Height

BMI

6MWT

4SC

RRF

10MW

Distance

SV50C

SV95C

SL50C

SL95C

Age

5–17 y

 

0.927**

0.667**

0.122

0.184

0.418**

 − 0.143

 − 0.083*

0.513**

 − 0.609**

0.829**

 − 0.099*

 

 ≥ 18 y

            

Height

5–17 y

0.909**

 

0.620**

0.157

0.137

0.389**

 − 0.149

 − 0.135

0.499**

 − 0.598**

0.883**

 − 0.037

 

 ≥ 18 y

 − 0.134

           

BMI

5–17 y

0.363**

0.356**

 

 − 0.204

0.057

0.390**

0.065

 − 0.091

0.321**

 − 0.575**

0.510**

 − 0.363**

 

 ≥ 18 y

0.627**

0.189

          

6MWD

5–17 y

0.6**

0.538**

 − 0.015

 

 − 0.135

 − 0.334**

 − 0.565**

0.101

0.336**

0.271*

0.212

0.465**

 

 ≥ 18 y

 − 0.703**

0.061

 − 0.559*

         

4SC

5–17 y

 − 0.142

 − 0.163

 − 0.303*

 − 0.033

 

0.607**

0.256*

 − 0.285**

 − 0.077

 − 0.3**

0.057

 − 0.224*

 

 ≥ 18 y

0.14

 − 0.288

0.181

0.054

        

RFF

5–17 y

 − 0.011

0.028

 − 0.008

 − 0.183

0.515**

 

0.181

 − 0.298**

 − 0.01

 − 0.631**

0.289**

 − 0.494**

 

 ≥ 18 y

0.447

0.01

0.432

 − 0.409

0.63**

       

10MW

5–17 y

 − 0.479**

 − 0.407**

 − 0.113

 − 0.595**

0.155

0.089

 

 − 0.362**

 − 0.377**

 − 0.203

 − 0.276*

 − 0.328**

 

 ≥ 18 y

0.434

 − 0.326

0.225

 − 0.373

0.415

0.362

      

Distance

5–17 y

0.03

 − 0.036

0.013

0.11

 − 0.232

 − 0.263*

 − 0.426**

 

0.455**

0.389**

0.081

0.289**

 

 ≥ 18 y

0.115

0.108

0.174

 − 0.078

 − 0.43

 − 0.241

 − 0.201

     

SV50C

5–17 y

0.621**

0.552**

0.292*

0.454**

 − 0.219

 − 0.222

 − 0.477**

0.451**

 

 − 0.053

0.74**

0.293**

 

 ≥ 18 y

 − 0.206

0.116

 − 0.113

0.444

 − 0.087

 − 0.018

 − 0.331

0.691**

    

SV95C

5–17 y

 − 0.231

 − 0.269*

 − 0.207

0.034

 − 0.117

 − 0.418**

 − 0.09

0.437**

0.114

 

 − 0.414**

0.734**

 

 ≥ 18 y

 − 0.738*

0.254

 − 0.397

0.858**

0.05

 − 0.385

 − 0.306

0.157

0.542*

   

SL50C

5–17 y

0.869**

0.876**

0.285

0.518**

 − 0.163

 − 0.1

 − 0.493**

0.148

0.786**

 − 0.098

 

0.16

 

 ≥ 18 y

 − 0.091

0.678**

 − 0.145

0.103

 − 0.27

0

 − 0.331

0.659**

0.684**

0.417

  

SL95C

5–17 y

0.312*

0.274*

 − 0.142

0.374**

 − 0.144

 − 0.405**

 − 0.298*

0.281*

0.418**

0.728**

0.455**

 
 

 ≥ 18 y

 − 0.561*

0.668**

 − 0.093

0.485*

 − 0.187

 − 0.256

 − 0.319

0.252

0.449

0.748**

0.721**

 
  1. Significance level p ≤ 0.01**, p ≤ 0.05*. Upper part: correlation on the whole sample. Lower part: correlation on the two age groups. BMI body mass index, 6MWT 6-min walk distance, 4SC 4-stair climb; RFF rise from floor; 10MW 10-m walk test; SV50C 50th centile stride velocity; SV95C 95th centile stride velocity; SL50C 50th centile stride length; SL95C 95th centile stride length