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WOMAC-VA3.0의 타당도 및 신뢰도-일부 슬관절 및 고관절 골관절염환자를 대상으로-

Validity and Reliability of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC)-VA3.0 inHip and Knee Osteoarthritis Patients

이현주|우영근|이승주
한국전문물리치료학회 (Korean Research Society of Physical Therapy)|2008.05|한국전문물리치료학회지 (Physical Therapy Korea)|제15권 제2호|pp. 20-29

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주제분류물리치료학

초록

The purpose of this study was to examine the validity and reliability of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC)-VA3.0 in patients with hip and knee osteoarthritis (OA). The sample consisted of 301 patients who had received treatments at the physical therapy units of 5 medical institutions in Andong City in June 2006. Questionnaires on the WOMAC were recruited by 12 physical therapists. The internal structure and reliability of the scales were evaluated by means of item-internal consistency (Cronbach's alpha coefficient: ⍺), item-discriminant validity, and Pearson's relation coefficient. To explore construct validity, we conducted a principal component factor analysis with varimax rotation analysis. The criterion for factor extraction was an eigenvalue >1.0. The average age of the patients was 62.1 years. All WOMAC subscales (pain, stiffness, and physical function) were internally consistent with Cronbach's coefficients of .81, .91, and .80, respectively. The internal consistency reliability of item-each scale were also internally consistent with Cronbach's coefficient of .89 (Pearson's correlation coefficient: .71～.84), .93 (.89～.91), and .96 (.67～.91), respectively. However, high correlation was found among 3 items (.66～.83, .66～.67, and .67～.83), so the item-discriminant validity was low (⍺ coefficient: .81, .91, .80, respectively). The construct validity by factor analysis was low because it was not consistent with WOMAC-VA3.0. In conclusion, the results reported here confirm the reliability of the WOMAC in patients with OA of the hip and knee. The collection of information on the hip and knee osteoarthritis using this instrument was acceptable to patients. A further prospective multi-center study will be necessary to prove the construct validity.

Abstract

The purpose of this study was to examine the validity and reliability of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC)-VA3.0 in patients with hip and knee osteoarthritis (OA). The sample consisted of 301 patients who had received treatments at the physical therapy units of 5 medical institutions in Andong City in June 2006. Questionnaires on the WOMAC were recruited by 12 physical therapists. The internal structure and reliability of the scales were evaluated by means of item-internal consistency (Cronbach's alpha coefficient: ⍺), item-discriminant validity, and Pearson's relation coefficient. To explore construct validity, we conducted a principal component factor analysis with varimax rotation analysis. The criterion for factor extraction was an eigenvalue >1.0. The average age of the patients was 62.1 years. All WOMAC subscales (pain, stiffness, and physical function) were internally consistent with Cronbach's coefficients of .81, .91, and .80, respectively. The internal consistency reliability of item-each scale were also internally consistent with Cronbach's coefficient of .89 (Pearson's correlation coefficient: .71～.84), .93 (.89～.91), and .96 (.67～.91), respectively. However, high correlation was found among 3 items (.66～.83, .66～.67, and .67～.83), so the item-discriminant validity was low (⍺ coefficient: .81, .91, .80, respectively). The construct validity by factor analysis was low because it was not consistent with WOMAC-VA3.0. In conclusion, the results reported here confirm the reliability of the WOMAC in patients with OA of the hip and knee. The collection of information on the hip and knee osteoarthritis using this instrument was acceptable to patients. A further prospective multi-center study will be necessary to prove the construct validity.

참고문헌 (22)

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