TY - JOUR
T1 - Psychometric properties of the Generalized Anxiety Disorder 7-item scale in youth
T2 - Screening in a primary care sample
AU - Hughes, Jennifer L.
AU - Grannemann, Bruce D.
AU - Trombello, Joseph M.
AU - Martin, W. Blake
AU - Fuller, Anne K.
AU - Trivedi, Madhukar H.
N1 - Publisher Copyright:
© 2021 Quadrant Healthcom Inc.. All rights reserved.
PY - 2021/11
Y1 - 2021/11
N2 - BACKGROUND: Anxiety disorders in youth are frequently underdiagnosed and untreated, partly due to a lack of screening in primary care. The Generalized Anxiety Disorder 7-item (GAD-7) scale is a brief self-report measure designed to screen for anxiety in primary care settings. However, little is known about the psychometrics of this scale with adolescents. METHODS: Participants included 579 youth age 11 to 17 years who received screening for depression in a primary care setting through a web-based application, VitalSign6, over a 4-year period. Psychometric analyses were completed based on classical test theory (CTT) and item response theory (IRT). RESULTS: Using CTT and IRT methods, the GAD-7 has a unidimensional structure with good psychometric properties. In addition, the IRT analysis demonstrates that items 1 and 2 are strongly associated with the total score, and thus are good choices as a 2-item screening tool. Convergent validity was demonstrated, with high correlations between the GAD-7 and other measures of anxiety, and discriminant validity was also demonstrated, with low correlations to measures of other psychological states. CONCLUSIONS: This psychometric evaluation of the GAD-7 provides support for the utility of this measure with adolescents. The GAD-2 is a good estimate of GAD-7 total score.
AB - BACKGROUND: Anxiety disorders in youth are frequently underdiagnosed and untreated, partly due to a lack of screening in primary care. The Generalized Anxiety Disorder 7-item (GAD-7) scale is a brief self-report measure designed to screen for anxiety in primary care settings. However, little is known about the psychometrics of this scale with adolescents. METHODS: Participants included 579 youth age 11 to 17 years who received screening for depression in a primary care setting through a web-based application, VitalSign6, over a 4-year period. Psychometric analyses were completed based on classical test theory (CTT) and item response theory (IRT). RESULTS: Using CTT and IRT methods, the GAD-7 has a unidimensional structure with good psychometric properties. In addition, the IRT analysis demonstrates that items 1 and 2 are strongly associated with the total score, and thus are good choices as a 2-item screening tool. Convergent validity was demonstrated, with high correlations between the GAD-7 and other measures of anxiety, and discriminant validity was also demonstrated, with low correlations to measures of other psychological states. CONCLUSIONS: This psychometric evaluation of the GAD-7 provides support for the utility of this measure with adolescents. The GAD-2 is a good estimate of GAD-7 total score.
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U2 - 10.12788/acp.0047
DO - 10.12788/acp.0047
M3 - Article
C2 - 34672926
AN - SCOPUS:85120570382
SN - 1040-1237
VL - 33
SP - 241
EP - 250
JO - Annals of Clinical Psychiatry
JF - Annals of Clinical Psychiatry
IS - 4
ER -