Validity and reliability of the Russian version of the revised Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS-R)

Objective The aim of this study is to elaborate a valid and reliable Russian version of the ALSFRS-R. Methods Russian adaptation of the ALSFRS-R was applied twice in 50 ALS patients followed by the test–retest analysis with a 7-day interval between applications and internal consistency analysis. Results Test–retest analysis showed very strong correlation for all of the ALSFRS-R variables. The intra-class correlation coefficient was 0.83. Conclusion The elaborated Russian version of the ALSFRS-R has shown to be comparable with the original English version of the scale.