Development of a Shortened Measure of Anxiety for Mechanically Ventilated Patients

2.50
Hdl Handle:
http://hdl.handle.net/10755/159478
Type:
Presentation
Title:
Development of a Shortened Measure of Anxiety for Mechanically Ventilated Patients
Abstract:
Development of a Shortened Measure of Anxiety for Mechanically Ventilated Patients
Conference Sponsor:Midwest Nursing Research Society
Conference Year:2002
Author:Chlan, Linda, PhD
P.I. Institution Name:University of Minnesota
Title:Assistant Professor
Contact Address:School of Nursing, 6-104 Weaver-Densford Hall, 308 Harvard Street SE, Minneapolis, MN, 55455, USA
Contact Telephone:612.624.6658
Anxiety is a common experience for critically ill mechanically ventilated patients (MVPs). Interventions to ameliorate anxiety can be pharmacologic and/or non-pharmacologic. However, significant measurement challenges exist in assessing anxiety via paper and pencil instruments in MVPs due to their inability to speak, problems focusing on lengthy scales, and difficulty understanding the response format. There is a lack of psychometrically sound instruments to measure anxiety in MVPs that balance the documented response burden associated with paper and pencil instruments. The purpose of this instrument development study was to devise a shortened, less burdensome scale from the state portion (SAI) of the Spielberger State-Trait Anxiety Inventory (STAI) for MVPs. A convenience, purposive sample of 200 alert, adult MVPs were recruited from 9 ICUs in the urban Midwest; 192 subjects completed the SAI. Exploratory factor analysis with the principal components method was used to reduce the 20-item SAI to a shorter scale. Factor models were assessed using the following diagnostic tests: Kaiser-Myer-Olkin, multicolinearity, Bartlett's test, and scree plot inspection. Varimax rotation assisted in factor interpretation. An item was considered to belong to a factor if it loaded at 0.5 or greater. Criteria for accepting the shortened scales as equivalent to the original SAI were that the amount of explained variance was equivalent to the 20-item scale, the individual items loaded on the same 2 factors, alpha levels remained high, with a high correlation between the shortened scale and the original scale. An 8 and a 6-item scale were realized that accounted for 60% and 65% of the variance, and correlated to the original SAI 0.95 and 0.92 respectively. Further work is needed to verify the factor structures via confirmatory factor analysis with another sample of MVPs. It is anticipated that the shortened SAI scales will be less burdensome for MVPs to complete.
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.titleDevelopment of a Shortened Measure of Anxiety for Mechanically Ventilated Patientsen_GB
dc.identifier.urihttp://hdl.handle.net/10755/159478-
dc.description.abstract<table><tr><td colspan="2" class="item-title">Development of a Shortened Measure of Anxiety for Mechanically Ventilated Patients</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">2002</td></tr><tr class="item-author"><td class="label">Author:</td><td class="value">Chlan, Linda, PhD</td></tr><tr class="item-institute"><td class="label">P.I. Institution Name:</td><td class="value">University of Minnesota</td></tr><tr class="item-author-title"><td class="label">Title:</td><td class="value">Assistant Professor</td></tr><tr class="item-address"><td class="label">Contact Address:</td><td class="value">School of Nursing, 6-104 Weaver-Densford Hall, 308 Harvard Street SE, Minneapolis, MN, 55455, USA</td></tr><tr class="item-phone"><td class="label">Contact Telephone:</td><td class="value">612.624.6658</td></tr><tr class="item-email"><td class="label">Email:</td><td class="value">chlan001@umn.edu</td></tr><tr><td colspan="2" class="item-abstract">Anxiety is a common experience for critically ill mechanically ventilated patients (MVPs). Interventions to ameliorate anxiety can be pharmacologic and/or non-pharmacologic. However, significant measurement challenges exist in assessing anxiety via paper and pencil instruments in MVPs due to their inability to speak, problems focusing on lengthy scales, and difficulty understanding the response format. There is a lack of psychometrically sound instruments to measure anxiety in MVPs that balance the documented response burden associated with paper and pencil instruments. The purpose of this instrument development study was to devise a shortened, less burdensome scale from the state portion (SAI) of the Spielberger State-Trait Anxiety Inventory (STAI) for MVPs. A convenience, purposive sample of 200 alert, adult MVPs were recruited from 9 ICUs in the urban Midwest; 192 subjects completed the SAI. Exploratory factor analysis with the principal components method was used to reduce the 20-item SAI to a shorter scale. Factor models were assessed using the following diagnostic tests: Kaiser-Myer-Olkin, multicolinearity, Bartlett's test, and scree plot inspection. Varimax rotation assisted in factor interpretation. An item was considered to belong to a factor if it loaded at 0.5 or greater. Criteria for accepting the shortened scales as equivalent to the original SAI were that the amount of explained variance was equivalent to the 20-item scale, the individual items loaded on the same 2 factors, alpha levels remained high, with a high correlation between the shortened scale and the original scale. An 8 and a 6-item scale were realized that accounted for 60% and 65% of the variance, and correlated to the original SAI 0.95 and 0.92 respectively. Further work is needed to verify the factor structures via confirmatory factor analysis with another sample of MVPs. It is anticipated that the shortened SAI scales will be less burdensome for MVPs to complete.</td></tr></table>en_GB
dc.date.available2011-10-26T22:03:13Z-
dc.date.issued2011-10-17en_GB
dc.date.accessioned2011-10-26T22:03:13Z-
dc.description.sponsorshipMidwest Nursing Research Societyen_GB
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