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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