TY - JOUR
T1 - Development and Validation of New Anxiety and Bipolar Symptom Scales for an Expanded Version of the IDAS (the IDAS-II)
AU - Watson, David
AU - O'Hara, Michael W.
AU - Naragon-Gainey, Kristin
AU - Koffel, Erin
AU - Chmielewski, Michael
AU - Kotov, Roman
AU - Stasik, Sara M.
AU - Ruggero, Camilo J.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - The original Inventory of Depression and Anxiety Symptoms (IDAS) contains 11 nonoverlapping scales assessing specific depression and anxiety symptoms. In creating the expanded version of the IDAS (the IDAS-II), our goal was to create new scales assessing other important aspects of the anxiety disorders as well as key symptoms of bipolar disorder. Factor analyses of the IDAS-II item pool led to the creation of seven new scales (Traumatic Avoidance, Checking, Ordering, Cleaning, Claustrophobia, Mania, Euphoria) plus an expanded version of Social Anxiety. These scales are internally consistent and show strong convergent and significant discriminant validity in relation to other self-report and interview-based measures of anxiety, depression, and mania. Furthermore, the scales demonstrate substantial criterion and incremental validity in relation to interview-based measures of DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, fourth edition) symptoms and disorders. Thus, the expanded IDAS-II now assesses a broad range of depression, anxiety, and bipolar symptoms.
AB - The original Inventory of Depression and Anxiety Symptoms (IDAS) contains 11 nonoverlapping scales assessing specific depression and anxiety symptoms. In creating the expanded version of the IDAS (the IDAS-II), our goal was to create new scales assessing other important aspects of the anxiety disorders as well as key symptoms of bipolar disorder. Factor analyses of the IDAS-II item pool led to the creation of seven new scales (Traumatic Avoidance, Checking, Ordering, Cleaning, Claustrophobia, Mania, Euphoria) plus an expanded version of Social Anxiety. These scales are internally consistent and show strong convergent and significant discriminant validity in relation to other self-report and interview-based measures of anxiety, depression, and mania. Furthermore, the scales demonstrate substantial criterion and incremental validity in relation to interview-based measures of DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, fourth edition) symptoms and disorders. Thus, the expanded IDAS-II now assesses a broad range of depression, anxiety, and bipolar symptoms.
KW - bipolar disorder
KW - claustrophobia
KW - factor analysis
KW - obsessive-compulsive disorder
KW - posttraumatic stress disorder
KW - scale construction
UR - http://www.scopus.com/inward/record.url?scp=84868665252&partnerID=8YFLogxK
U2 - 10.1177/1073191112449857
DO - 10.1177/1073191112449857
M3 - Article
C2 - 22822173
AN - SCOPUS:84868665252
SN - 1073-1911
VL - 19
SP - 399
EP - 420
JO - Assessment
JF - Assessment
IS - 4
ER -