Dependent variables Between-Group Differences Age Level of SCI Severity of SCI Overall differences p=0.002 p<0.0001 p<0.0001 Specific differences *       Group 1 versus Group 2 p=0.023 p<0.0001 p=0.183 Group 1 versus Group 3 p=0.016 p<0.0001 p<0.0001 Group 2 versus Group 3 p=0.925 p=0.002 p<0.0001 * Group 1 = Potential surgical candidates based on U/E motor function; Group 2 = ineligible for surgery due to insufficient U/E motor function; group 3 = ineligible for surgery given sufficient U/E motor function with no added function expected with surgery.

Table 1: Summary of the statistical results highlighting differences across the three subgroups of participants