Maxwell O Adibe 
,
Cletus N Aguwa,
Chinwe V Ukwe
For correspondence:- Maxwell Adibe Email: maxolpharmacia@yahoo.com Tel:+2348037781479
Received: 1 December 2010 Accepted: 15 August 2011 Published: 23 October 2011
Citation: Adibe MO, Aguwa CN, Ukwe CV. The Construct Validity of an Instrument for Measuring Type 2 Diabetes Self-Care Knowledge in Nigeria. Trop J Pharm Res 2011; 10(5):619-629 doi: 10.4314/tjpr.v10i5.11
© 2011 The authors.
This is an Open Access article that uses a funding model which does not charge readers or their institutions for access and distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0) and the Budapest Open Access Initiative (http://www.budapestopenaccessinitiative.org/read), which permit unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited..
Purpose: To develop an instrument (DSCKQ-30) for measuring type 2 diabetic patients’ knowledge of self-care practices.
Methods: A 30-item questionnaire (DSCKQ-30) consisting of close ended questions was developed for this study. DSCKQ-30 was self administered to a cross-section of randomly selected 400 ambulatory adult diabetic patients (≥ 18 years), who were attending endocrinology clinics at the hospitals included in this study. The sex distribution for female and male was 56.7 and 43.3% respectively. Factor analysis and item analysis were performed to test the construct validity and reliability of the instrument. Item performance was measured by item discrimination (item-to-total correlation) and percent correctness (%C).
Results: The response rate was 78.5%. Factor analysis identified three scales of knowledge of self-care management. Chronbach’s alpha of the 30 questionnaire items was found to be 0.89. The item-to-total correlation coefficients and ranges for component 1 - 3 were 0.36 (0.25 - 0.48), 0.28 (0.23 - 0.35), and 0.34 (0.23 - 0.41), respectively, with overall average of 0.33 (0.23 - 0.48). Items percent correctness (% C) ranged from 16.7 to 86.7 % with an overall average of 55.6 %. Item factor loadings averaged 0.62 for the total items; averages of the three scales ranged from 0.59 to 0.68.
Conclusion: The DSCKQ-30 provided a quantitative measure of patient's knowledge of self-care practices.
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