뇌졸중 환자의 Four Square Step Test의 신뢰도와 타당도
The Reliability and Validity of the Four Square Step Testin Stroke Patients
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초록
본 연구의 목적은 뇌졸중 환자의 Four Square Step Test(FSST)의 측정자간·검사-재검사 신뢰도와 타당도를 알아보고자 하였다. 본 연구에 참여한 만성 뇌졸중 환자 32명을 대상으로 FSST 소요 시간의 측정자간·검사-재검사 신뢰도는 상대적 신뢰도 지수 인(급간내상관계수: Intra Class Coefficient, ICC)를 이용하였다. 또한 절대적 신뢰도 지수인 표준 측정 오차(Standard Error Measurement, SEM)와 최소 감지 변화(Minimal Detectable Change, MDC) 및 Bland and Altman(일치 한계) 분석이 포함되었다. FSST의 동시 타당도는 8자 경로 보행 검사(Figure-Eight Walk Test, F8WT), 10m 보행 속도, 푸글마이어 하지 운동 기능(Fugl Meyer Assessment-Lower/extremity, FMA-L/E), 일어나 걸어가기 검사(Timed Up & Go Test, TUG), 버그 균형 척도(Berg Balance Scale, BBS)간의 스피어만 상관 계수(Spearman Correlation Coefficient)를 이용하였다. FSST 소요 시간의 측정자간, 검사-재검사 신뢰도 ICC=0.93∼0.97(0.86∼0.98), SEM은 각각 0.91, 1.52, MDC는 각각 2.51, 4.21로 신뢰할 수 있는 수준(<15%)인 것으로 확인되었다. FSST 소요시간은 F8WT(r=0.91), 10m 보행 속도(r=-0.83), FMA-L/E(r=-0.81), TUG(r=0.85) ,BBS(r=-0.82)와는 높은 상관관계가 있는 것으로 확인되었다. 만성 뇌졸중 환자들의 FSST 소요 시간은 높은 측정자간·검사-재검사 신뢰도가 있었고, 뇌졸중 특이성 장애인 마비측 하지 운동 기능과 균형 능력 및 직선과 곡선(회전) 보행 검사와 높은 관련성이 있었다. 따라서 임상에서 FSST 소요 시간은 만성 뇌졸중 환자의 동적 균형 능력을 평가하는데 빠르고 쉽게 적용이 가능한 평가 도구가 될 수 있을 것이다.
Abstract
To establish the Interㆍtest-retest reliabilities of the Four Square Step Test(FSST) times and associations with stroke-specific impairments. A total of 32 subjects with chronic stroke participated in this study. A relative reliability index (intraclass correlation coefficient, ICC) was used to examine the level of agreement of inter-raterㆍtest-retest reliability for FSST times. Also Absolute reliability indices, including the standard error of measurement(SEM) and the minimal detectable change(MDC), and limits of agreement by Bland and Altman analysis. The validity was demonstrated by spearman correlation of FSST time with Figure-Eight Walk Test(F8WT), 10m Walk Test(10mWT), Fugl Meyer Assessment- Lower/Extremity(FMA-L/E), Timed Up & Go Test(TUG), Berg Balance Scale(BBS). Excellent Inter-raterㆍtest-retest reliabilities(ICC range 0.93 to 0.97) of FSST times were found. It all showed acceptable SEM(0.91∼1.52) and MDC(2.51, 4.21)respectively(<15%). The FSST times were significantly correlated with F8WT times(r=0.91), 10mWT(r=-0.83), FMA-L/E(r=-0.81), TUG(r=0.85) and BBS(r=-0.82). Conclusions: The FSST times is a reliable measurement tool and significantly associated with stroke-specific impairments and walking tests(straight, curved walking and turning task). The FSST is could be an easy-to-administer clinical test with chronic stroke to assess dynamic standing balance.
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