Journal List > Korean J Adult Nurs > v.32(1) > 1142895

Song and Hong: Validity and Reliability of the Korean Version of the Basic Physical Capability Scale for Older Adults



This study aimed to verify the validity and reliability of the Korean version of the Basic Physical Capability Scale (BPCS-K).


The BPCS was translated into Korean using forward and back translations. Data were collected from January 16 to May 10, 2019. The study participants comprised 285 older adults, with 147 recruited from an acute care setting, and 138, who had dementia, were from long-term care facilities. Data analysis included KR-20, intraclass correlation coefficient, independent t-test, Kruskal-Wallis H test, hierarchical multiple regression, and Rasch analysis (item difficulty, infit/outfit, separation index, reliability index, and differential item function analysis), and were conducted using SPSS/WIN 25.0 and R programs. The criterion-related validity was examined using the Barthel Index.


The KR-20 reliability coefficient was .93 and the intraclass correlation coefficient for 2-week test-retest reliability was .97. The BPCS-K scores were significantly different compared to the known groups. Moreover, controlling for age, gender, and cognitive status, the Barthel Index score was significantly associated with the BPCS-K scores. Rasch analysis supported good construct validity.


The findings suggest that the 16-item BPCS-K is an appropriate instrument to measure basic physical capability in Korean older adults. The BPCS-K can establish individualized physical activity goals for the elderly in a variety of clinical settings and can also serve to measure changes of physical function in physical activity interventions for older adults.

Figures and Tables

Figure 1

Plot person-item map.

Table 1

General Characteristics of Participants (N=285)


SD=standard deviation; Korean version mini-mental state examination score; Korean barthel index score; §Counting unit=days; Counting unit=month.

Table 2

Rasch Model Testing Fit Statistics (N=285)


Diff.=Difficulty; SD=standard deviation; 1 is the easiest item to do correctly and higher numbers indicate increasing difficulty.

Table 3

Factors Associated with Physical Activity (N=285)


CI=confidence interval; SE=standard error; Korean version mini-mental state examination score.

Table 4

Differences in BPCS-K Score by Known-groups (N=285)


BPCS-K=Korean version of the Basic Physical Capability Scale; SD=standard deviation; Korean version mini-mental state examination score.


CONFLICTS OF INTEREST The authors declared no conflict of interest.


  • Study conception and design acquisition - SE-O and HG-RS.

  • Data collection - SE-O.

  • Analysis and interpretation of the data - SE-O.

  • Drafting of the manuscript - SE-O and HG-RS.

  • Critical revision of the manuscript - SE-O and HG-RS.

  • Final approval; SE-O and HG-RS.


Appendix 1



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Eun-Ok Song

Gwi-Ryung Son Hong

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