KMID : 1007420100080020138
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Mood and Emotion 2010 Volume.8 No. 2 p.138 ~ p.144
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Reliability and Validity of the Longitudinal Interval Follow-up Evaluation-Range of Impaired Functioning Tool (LIFE-RIFT)
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Kook So-Dahm
Ryu Vin Kim Woo-Jung Kim Kyung-Ran Lee Eun Kim Se-Joo Jon Duk-In Cho Hyun-Sang
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Abstract
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Background and Objectives£ºIn this study, we assessed reliability and validity of Longitudinal Interval Followup Evaluation-Range of Impaired Functioning Tool (LIFE-RIFT) with study samples consisted of Korean bipolar disorder patients, and evaluated its availability as a tool for reflecting psycho-social functioning.
Materials and Method£ºThe subjects consisted of 28 acute manic or depressive bipolar patients, 72 euthymic bipolar patients,and 69 normal control groups. We compared and supervised Korean version of LIFE-RIFT first. Then we measured its concurrent validity of it by conducting LIFE-RIFT and GAF on patient groups and normal control groups.
We also measured discriminative validity by comparing three groups described above. Inter-rater reliability and testretest reliability were analyzed on 17 patients and 14 patients, respectively, and internal consistency of each item was evaluated.
Results£ºInternal consistency of each item of LIFE-RIFT obtained was high with Cronbach¡¯s ¥á=0.75. The correlation between LIFE-RIFT and GAF was negative to a reasonable degree with r=-0.623, p<0.001. The discriminative validity showed significant difference to a reasonable degree among three groups (acute manic/depressive patient group, euthymic patient group and control group) with p<0.001. This phenomenon was also observed between euthymic state patient group and control group with p<0.001. Test-retest reliability and interrater reliability was high with intraclass coefficient (ICC)=0.85 and ICC=0.98, respectively.
Conclusion£ºKorean version of LIFE-RIFT showed significant reliability and validity in evaluating Korean bipolar disorder patients. Therefore,as proven in other countries, this system can be a useful tool for the assessment of psycho-social functioning in Korea.
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KEYWORD
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Bipolar disorder, Psychosocial function, LIFE-RIFT, Validity, Reliability
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