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Logo of bmcpsycBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Psychiatry
 
BMC Psychiatry. 2011; 11: 191.
Published online Dec 7, 2011. doi:  10.1186/1471-244X-11-191
PMCID: PMC3266209
General and specific components of depression and anxiety in an adolescent population
Jeannette Brodbeck,1 Rosemary A Abbott,1 Ian M Goodyer,1 and Tim J Croudacecorresponding author1
1Developmental and Life-course Research Group, Department of Psychiatry, University of Cambridge, Douglas House, 18b Trumpington Road, Cambridge, CB2 8AH, UK
corresponding authorCorresponding author.
Jeannette Brodbeck: jb669/at/medschl.cam.ac.uk; Rosemary A Abbott: raa25/at/medschl.cam.ac.uk; Ian M Goodyer: ig104/at/cam.ac.uk; Tim J Croudace: tjc39/at/cam.ac.uk
Received August 24, 2011; Accepted December 7, 2011.
Abstract
Background
Depressive and anxiety symptoms often co-occur resulting in a debate about common and distinct features of depression and anxiety.
Methods
An exploratory factor analysis (EFA) and a bifactor modelling approach were used to separate a general distress continuum from more specific sub-domains of depression and anxiety in an adolescent community sample (n = 1159, age 14). The Mood and Feelings Questionnaire and the Revised Children's Manifest Anxiety Scale were used.
Results
A three-factor confirmatory factor analysis is reported which identified a) mood and social-cognitive symptoms of depression, b) worrying symptoms, and c) somatic and information-processing symptoms as distinct yet closely related constructs. Subsequent bifactor modelling supported a general distress factor which accounted for the communality of the depression and anxiety items. Specific factors for hopelessness-suicidal thoughts and restlessness-fatigue indicated distinct psychopathological constructs which account for unique information over and above the general distress factor. The general distress factor and the hopelessness-suicidal factor were more severe in females but the restlessness-fatigue factor worse in males. Measurement precision of the general distress factor was higher and spanned a wider range of the population than any of the three first-order factors.
Conclusions
The general distress factor provides the most reliable target for epidemiological analysis but specific factors may help to refine valid phenotype dimensions for aetiological research and assist in prognostic modelling of future psychiatric episodes.
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