caa a22 4500 606238514 CHVBK 20210128101258.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10862-014-9440-3 doi (NATIONALLICENCE)springer-10.1007/s10862-014-9440-3 Assessing Usual Seasonal Depression Symptoms: The Seasonality Assessment Form [Elektronische Daten] [Michael Young, Paul Hutman, Justin Enggasser, Ybe Meesters] This paper presents findings on the psychometric properties of a new measure of the usual severity of winter symptomatology commonly found in Seasonal Affective Disorder (SAD), the Seasonality Assessment Form (SAF). Many existing SAD-related measures focus on diagnostic screening, include a limited range of symptoms or are revisions of standard self-report depression measures that have not undergone psychometric evaluation. The SAF was developed to address these limitations, in particular to include the full range of cognitive, affective, and vegetative symptoms that are in DSM criteria for a depressive episode. Data came from a diverse sample of 741 students, community members recruited for having winter vegetative changes, and diagnosed SAD patients. The SAF total score, as well as vegetative and cognitive/affective subscales, exhibited good internal consistency and convergent and construct validity. The SAF demonstrated a bifactor structure, suggesting a large global severity factor and additional subfactors related to appetite/weight and negative thought content. Symptomatic participants reported relatively high levels of impairment in daily activities, in particular avoiding or delaying doing daily tasks. In sum, the SAF appears to be a concise, comprehensive, reliable, and valid measure of SAD symptom severity. In addition, its instructions can be revised easily to provide parallel forms for assessing the current episode or recent weeks. Springer Science+Business Media New York, 2014 Seasonal affective disorder nationallicence Seasonality nationallicence Depression nationallicence Symptom assessment nationallicence Factor analysis nationallicence Impairment nationallicence Young Michael Department of Psychology, Illinois Institute of Technology, 3105 South Dearborn, Room 252, 60616-3793, Chicago, IL, USA aut Hutman Paul Department of Psychology, Illinois Institute of Technology, 3105 South Dearborn, Room 252, 60616-3793, Chicago, IL, USA aut Enggasser Justin VA Boston Healthcare System and Boston University School of Medicine, Boston, USA aut Meesters Ybe University Center for Psychiatry, University Medical Center Groningen, Groningen, Netherlands aut Journal of Psychopathology and Behavioral Assessment Springer US; http://www.springer-ny.com 37/1(2015-03-01), 112-121 0882-2689 37:1<112 2015 37 10862 https://doi.org/10.1007/s10862-014-9440-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10862-014-9440-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Young Michael Department of Psychology, Illinois Institute of Technology, 3105 South Dearborn, Room 252, 60616-3793, Chicago, IL, USA aut NATIONALLICENCE 700 1- Hutman Paul Department of Psychology, Illinois Institute of Technology, 3105 South Dearborn, Room 252, 60616-3793, Chicago, IL, USA aut NATIONALLICENCE 700 1- Enggasser Justin VA Boston Healthcare System and Boston University School of Medicine, Boston, USA aut NATIONALLICENCE 700 1- Meesters Ybe University Center for Psychiatry, University Medical Center Groningen, Groningen, Netherlands aut NATIONALLICENCE 773 0- Journal of Psychopathology and Behavioral Assessment Springer US; http://www.springer-ny.com 37/1(2015-03-01), 112-121 0882-2689 37:1<112 2015 37 10862