Research Article

Reliability and Validity of Fall Efficacy Scale-International in People with Parkinson’s Disease during On- and Off-Drug Phases

Table 2

Characteristics statistic of Fall Efficacy Scale-International (FES-I) in patients with idiopathic Parkinson’s disease ().

Drug phaseMean (±SD)RangeFloor effectCeiling effectSkewnessSEMCronbach’s αICC (test-retest) (95% IC)

On27.34 (11.32)16–6434.67%1.61%1.002.770.960.94 (0.90–0.96)
Off33.38 (15.41)16–6421.77%7.25%0.644.620.980.91 (0.86–0.94)

SEM: standard error of measurement. 95% IC: 95% lower and upper confidence bounds for the ICC statistics are given in parentheses.