[Purpose] This study was aimed to determine the relative and absolute reliability of
Korean version tools of the Berg Balance Scale (BBS), the Timed Up and Go (TUG), the
Four-Meter Walking Test (4MWT) and the Groningen Meander Walking Test (GMWT) in patients
with dementia. [Subjects and Methods] A total of 53 patients with dementia were tested on
TUG, BBS, 4MWT and GMWT with a prospective cohort methodological design. Intra-class
Correlation Coefficients (ICCs) to assess relative reliability and the standard error of
measurement (SEM), minimal detectable change (MDC95) and its percentage
(MDC%) to analyze the absolute reliability were calculated. [Results]
Inter-rater reliability (ICC(2,3)) of TUG, BBS and GMWT was 0.99 and that of
4MWT was 0.82. Inter-rater reliability was high for TUG, BBS and GMWT, with low SEM,
MDC95, and MDC%. Inter-rater reliability was low for 4MWT, with
high SEM, MDC95, and MDC%. Test-retest (ICC(2,3)) of TUG,
BBS and GMWT was 0.96–0.99 and Test-retest (ICC(2,3)) of 4MWT was 0.85. The
test-retest was high for TUG, BBS and GMWT, with low SEM, MDC95, and
MDC%, but it was low for 4MWT, with high SEM, MDC95, and
MDC%. [Conclusion] The relative reliability was high for all the assessment
tools. The absolute reliability has a reasonable level of stability except the 4MWT.