Abstract
This study aimed to evaluate the psychometric properties of the Elderly Mobility Scale (EMS) in an acute hospital setting. Intra-rater (n=15) and inter-rater (n=18) reliability were investigated using physiotherapists who viewed and scored video-recorded mobility assessments using the EMS on two occasions, one week apart. Latent class analysis of EMS scores showed that neither the occasion of testing (intra-rater reliability) (R2=0.0035, p=0.72), therapist (inter-rater reliability (R2=0.0051, p=1.00), years of experience (R2=0.0058, p=1.00) nor number of EMS assessments previously completed (R2=0.0048, p=1.00) had any impact on the EMS scores. The only factor which impacted on clustering was the EMS score (R2=0.8263, p=0.000). Concurrent validity was assessed by comparison with the Modified Rivermead Mobility Index (MRMI) in patients aged ≥ 55 years (n = 32) and demonstrated that EMS scores were highly correlated with the MRMI (Spearman’s ρ=0.887). Therefore intra-rater reliability of the EMS has been reported for the first time, and inter-rater reliability and concurrent validity of the EMS have been further supported and extended into a younger patient group for mobility assessment in acute hospital patients.
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