Reliability and concurrent validity of the Spinal Cord Independence Measure III among rehabilitation professionals

Abstract

Study design: A cross-sectional design.

Objectives: To investigate rater reliability of the Spinal Cord Independence Measure or SCIM III among rehabilitation professionals, along with the concurrent validity of the tool as compared to standard measures covering wheelchair users (WU) and ambulatory (AM) individuals with spinal cord injury (SCI).

Setting: A tertiary rehabilitation center and communities.

Methods: Eighty-two participants with SCI (39 WU and 43 AM individuals) were assessed using SCIM III items. The data of first 30 participants were video recorded for rater reliability assessments by seven rehabilitation professionals, including nurses, occupational therapists, and physical therapists (one novice and one experienced rater for each professional). All participants were also assessed using standard measures to verify concurrent validity of SCIM III by an experienced rater.

Results: The SCIM III showed excellent intra-rater and inter-rater reliability among rehabilitation professionals when analyzed for overall items (intraclass correlation coefficient (ICC) >0.90) and separately for each subscale (kappa values >0.80). The total SCIM III of WU and the mobility scores of AM participants showed significant correlation with standard measures for muscle strength, limit of stability, balance control, functional endurance, and walking ability (r_s = 0.343-0.779; p < 0.05).

Conclusions: The present findings extend clinical benefit and confirm the use of SCIM III interchangeably among rehabilitation professionals after they have been adequately trained. The findings are important for community-based rehabilitation and home healthcare services, especially during the coronavirus (COVID-19) pandemic, when hospital beds and in-patient services are limited for individuals with SCI.