Evaluating the Validity and Reliability of the Attitudes Towards Medication-Depression Scale

2.50
Hdl Handle:
http://hdl.handle.net/10755/160212
Type:
Presentation
Title:
Evaluating the Validity and Reliability of the Attitudes Towards Medication-Depression Scale
Abstract:
Evaluating the Validity and Reliability of the Attitudes Towards Medication-Depression Scale
Conference Sponsor:Midwest Nursing Research Society
Conference Year:2007
Author:Hagerty, Bonnie, PhD, RN, CS
P.I. Institution Name:University of Michigan
Contact Address:School of Nursing, Ann Arbor, MI, 48109, USA
Co-Authors:R.A. Williams, School of Nursing, University of Michigan, Ann Arbor, MI and J.E. Aikens, Depression Center, University of Michigan, Ann Arbor, MI
Major Depressive Disorder is a prevalent, serious public health problem. Most patients are treated for depression in primary care settings, often with antidepressants that have a high rate of success in reducing depressive symptoms. Yet, more than 50-75% do not adhere to their prescribed antidepressants. The purpose of this study was to test the psychometric characteristics of the Attitudes Towards Medication- Depression Scale. This was a methodological study. The ATM-D was designed as a clinical tool to assess patients' cognitive representations of antidepressants in order to target tailored educational interventions towards patients' specific concerns about the medication. In a limited amount of time, educational efforts can be directed strategically to those areas related to medication adherence. Items for the instrument were developed using Leventhal's Common Sense Model. Items were developed for each of the 5 categories of cognitive representations; identity, cause, consequences, time, and controllability. A panel of experts evaluated content validity and had a 94.4% agreement that items were relevant to the 5 a priori groups as defined by the model and at this point, no items were deleted. Participants on antidepressants for a diagnosis of depression were recruited from clinical sites at a major medical center through advertising flyers. Data were collected through mailed surveys at two time points, entry into the study and 3 months later. A total of 125 participants completed surveys at both time points. Construct validity was examined by exploratory factor analysis at time 1 and confirmatory factor analysis at time 2. Analyses revealed 3 distinct factors; consequences, identity, and controllability. Cronbach's coefficients alpha were .85, .84, and .76 respectively. Scores on the ATM-D were positively and moderately related to scores on a Medication Beliefs Scale, supporting construct validity of the instrument. This study provides initial support for the content and construct validity and internal consistency reliability of the ATM-D. Future studies will examine the relationship between scores on the ATM-D and adherence to antidepressants.
Repository Posting Date:
26-Oct-2011
Date of Publication:
17-Oct-2011
Sponsors:
Midwest Nursing Research Society

Full metadata record

DC FieldValue Language
dc.typePresentationen_GB
dc.titleEvaluating the Validity and Reliability of the Attitudes Towards Medication-Depression Scaleen_GB
dc.identifier.urihttp://hdl.handle.net/10755/160212-
dc.description.abstract<table><tr><td colspan="2" class="item-title">Evaluating the Validity and Reliability of the Attitudes Towards Medication-Depression Scale</td></tr><tr class="item-sponsor"><td class="label">Conference Sponsor:</td><td class="value">Midwest Nursing Research Society</td></tr><tr class="item-year"><td class="label">Conference Year:</td><td class="value">2007</td></tr><tr class="item-author"><td class="label">Author:</td><td class="value">Hagerty, Bonnie, PhD, RN, CS</td></tr><tr class="item-institute"><td class="label">P.I. Institution Name:</td><td class="value">University of Michigan</td></tr><tr class="item-address"><td class="label">Contact Address:</td><td class="value">School of Nursing, Ann Arbor, MI, 48109, USA</td></tr><tr class="item-email"><td class="label">Email:</td><td class="value">bmkh@umich.edu</td></tr><tr class="item-co-authors"><td class="label">Co-Authors:</td><td class="value">R.A. Williams, School of Nursing, University of Michigan, Ann Arbor, MI and J.E. Aikens, Depression Center, University of Michigan, Ann Arbor, MI</td></tr><tr><td colspan="2" class="item-abstract">Major Depressive Disorder is a prevalent, serious public health problem. Most patients are treated for depression in primary care settings, often with antidepressants that have a high rate of success in reducing depressive symptoms. Yet, more than 50-75% do not adhere to their prescribed antidepressants. The purpose of this study was to test the psychometric characteristics of the Attitudes Towards Medication- Depression Scale. This was a methodological study. The ATM-D was designed as a clinical tool to assess patients' cognitive representations of antidepressants in order to target tailored educational interventions towards patients' specific concerns about the medication. In a limited amount of time, educational efforts can be directed strategically to those areas related to medication adherence. Items for the instrument were developed using Leventhal's Common Sense Model. Items were developed for each of the 5 categories of cognitive representations; identity, cause, consequences, time, and controllability. A panel of experts evaluated content validity and had a 94.4% agreement that items were relevant to the 5 a priori groups as defined by the model and at this point, no items were deleted. Participants on antidepressants for a diagnosis of depression were recruited from clinical sites at a major medical center through advertising flyers. Data were collected through mailed surveys at two time points, entry into the study and 3 months later. A total of 125 participants completed surveys at both time points. Construct validity was examined by exploratory factor analysis at time 1 and confirmatory factor analysis at time 2. Analyses revealed 3 distinct factors; consequences, identity, and controllability. Cronbach's coefficients alpha were .85, .84, and .76 respectively. Scores on the ATM-D were positively and moderately related to scores on a Medication Beliefs Scale, supporting construct validity of the instrument. This study provides initial support for the content and construct validity and internal consistency reliability of the ATM-D. Future studies will examine the relationship between scores on the ATM-D and adherence to antidepressants.</td></tr></table>en_GB
dc.date.available2011-10-26T22:43:50Z-
dc.date.issued2011-10-17en_GB
dc.date.accessioned2011-10-26T22:43:50Z-
dc.description.sponsorshipMidwest Nursing Research Societyen_GB
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