Adaptation and Validation of the Foot Function Index-Revised Short Form into Polish

Table 2

Reliability: Cronbach’s alpha value and intraclass correlation coefficient.

FFI-RS	Cronbach’s alpha	ICC
FFI-RS total	0.95	0.81
FFI-RS pain	0.81	0.84
FFI-RS stiffness	0.85	0.81
FFI-RS difficulty	0.93	0.79
FFI-RS activity limitation	0.58	0.79
FFI-RS social issues	0.85	0.78

FFI-RS: Foot Function Index-Short Form; ICC: intraclass correlation coefficient.