Items from patient-oriented instruments can be integrated into interval scales to operationalize categories of the International Classification of Functioning, Disability and Health

作者：Cieza Alarcos; Hilfiker Roger; Boonen Annelies; Chatterji Somnath; Kostanjsek Nenad; Uestuen Bedirhan T; Stucki Gerold^*

来源：Journal of Clinical Epidemiology, 2009, 62(9): 912-921.

DOI：10.1016/j.jclinepi.2008.04.011

• Outcome
• assessment
• Health
• Psychometrics
• Classification
• Questionnaires
• Fatigue

Objective: To exemplify the construction of interval scales for specified categories of the International Classification of Functioning, Disability and Health (ICF) by integrating items from a variety of patient-oriented instruments.
Study Design and Setting: Psychometric study using data from a convenience sample of 122 patients with rheumatoid arthritis. Patients completed six different patient-oriented instruments. The contents of the instrument items were linked to the ICF. Rasch analyses for ordered-response options were used to examine whether the instrument items addressing the ICF category b130: Energy and drive functions constitute a psychometrically sound interval scale.
Results: Nineteen items were linked to b130: Energy and drive functions. Sixteen of the 19 items fit the Rasch model according to the chi-square (chi(2)) statistic (X(df)(2) =32 = 38.25, P = 0.21) and the Z-fit statistic (Z(Mean) = 0.451, Z(SD) = 1.085 and Z(Mean) = -0.223, Z(SD) = 1.132 for items and persons, respectively). The Person Separation Index r(beta) was 0.93.
Conclusion: The ICF category interval scales to operationalize single ICF categories can be constructed. The original format of the items included in the interval scales remains unchanged. This study represents a step forward in the operationalization and future implementation of the ICF.

• 出版日期2009-9
• 单位河北医科大学