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Kim and Jung: Psychometric Properties of the Alzheimer's Disease Knowledge Scale-Korean Version
Original Article

Journal of Korean Academy of Nursing 2015; 45(1): 107-117.

Published online: 27 February 2015

DOI: https://doi.org/10.4040/jkan.2015.45.1.107

Psychometric Properties of the Alzheimer's Disease Knowledge Scale-Korean Version

Eun Joo Kim1, Ji-young Jung2

1Department of Nursing, Daejeon University, Daejeon, Korea.

2Department of Nursing, Wonkwang Health Science University, Iksan, Korea.

Address reprint requests to: Jung, Ji-young. Department of Nursing, Wonkwang Health Science University, 514 Iksan-daero, Iksan 570-750, Korea. Tel: +82-63-840-1318, Fax: +82-63-840-1319, jio110@wu.ac.kr

Received 3 September 2014       Revised 24 September 2014       Accepted 2 January 2015

© 2015 Korean Society of Nursing Science

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution NoDerivs License. (http://creativecommons.org/licenses/by-nd/4.0/) If the original work is properly cited and retained without any modification or reproduction, it can be used and re-distributed in any format and medium.

Abstract

Purpose

The purpose of this study was to evaluate the psychometric properties of the Korean version of the Alzheimer's Disease Knowledge Scale (ADKS-K) to determine its applicability to Korean adults.

Methods

Cross-cultural validity was performed according to Consensus-based Standards for the Selection of Health Measurement Instruments (COSMIN). The Kuder-Richardson Formula 20 for internal consistency and Intraclass Correlation Coefficient (ICC) for test-retest reliability were conducted. Content validity, criterion related validity and construct validity were evaluated. The Classical Test Theory (CTT) model and the Item Response Theory (IRT) model were applied in performing the item analysis.

Results

The KR 20 was .71, and the ICC was .90, indicating that the ADKS-K has internal consistency and stability reliability. Thirty items of the ADKS-K had significant Content Validity Ratio (CVR) values, i.e., mean of 0.82 and range of 0.60~1.00. Mean item difficulty and discrimination indices calculated by TestAn program were 0.63 and 0.23, respectively. Mean item difficulty and discrimination indices calculated by BayesiAn program were -0.60 and 0.77, respectively. These tests indicate that ADKS-K has an acceptable level of difficulty and discriminating efficiency.

Conclusion

Results suggest that ADKS-K has the potential to be a proper instrument for assessing AD knowledge in Korean adults.

Keywords: Alzheimer disease, Health literacy, Reliability and validity

Figures and Tables

Table 1

General Characteristics and ADKS-K Score (N=575)

jkan-45-107-i001

*Scheffé post Hoc test; ADKS-K=Alzheimer's Disease Knowledge Scale-Korean; KR-20=Kuder-Richardson Formula 20; AD=Alzheimer's Disease

Table 2

Pearson Correlation Coefficient and Intraclass Correlation Coefficient for Test-retest (N=40)

jkan-45-107-i002

ICC=Intra correlation coefficient; CI=Confidence interval.

Table 3

Pearson Correlation Coefficient between Dementia Score and K-ADKS Score (N=575)

jkan-45-107-i003

ADKS-K=Alzheimer's Disease Knowledge Scale-Korean.

Table 4

Individual Item Properties Using Classic Test Theory and Item Response Theory and Content Validity Index

jkan-45-107-i004

CVR=Content validity ratio; CTT=Classic test theory; IRT=Item response theory.

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