Abstract
Zusammenfassung. Beim Einsatz der Center for Epidemiological Studies Depression Scale (CES-D) stellt sich das Problem der Dimensionalität des Instruments, dessen Lösung durch die Konfundierung eines Teilkonstruktes (“Wohlbefinden”) mit Besonderheiten der Itemformulierung Schwierigkeiten bereitet, da Antwortartefakte zu erwarten sind. Dimensionsstruktur und Eignung der CES-D zur Erfassung der Depression bei älteren Menschen wurden an einer Stichprobe von 663 über 75-jährigen Teilnehmern der “Leipziger Langzeitstudie in der Altenbevölkerung” untersucht. Da sich die Annahme der Gültigkeit eines partial-credit-Rasch-Modells sowohl für die Gesamtstichprobe als auch für eine Teilpopulation als zu restriktiv erwies, wurde ein 3- bzw. 4-Klassen-latent-class-Modell für geordnete Kategorien berechnet und die 4-Klassen-Lösung als den Daten angemessen interpretiert: Drei Klassen zeigten sich im Sinne des Konstrukts “Depression” geordnet, eine Klasse enthielt jene Respondenten, deren Antwortmuster auf ein Antwortartefakt hinwiesen. In dieser Befragtenklasse wird der Depressionsgrad offensichtlich überschätzt. Zusammenhänge mit Alter und Mini-Mental-State-Examination-Score werden dargestellt. Nach unseren Ergebnissen muß die CES-D in einer Altenbevölkerung mit Vorsicht eingesetzt werden, der Summenscore sollte nicht verwendet werden.
Abstract. Employing the Center for Epidemiological Studies Depression Scale (CES-D) we are confronted with very specific artifacts resulting from the confounding of one aspect of the construct (“well being”) with the direction of the item wording. We investigated the structure and applicability of the CES-D by means of a sample of 663 individuals over 75 years of age within the “Leipzig Longitudinal Study in the Aged.” Since the assumptions of a partial-credit Rasch model turned out to be too restrictive, one 3- and one 4- class latent-class model for ordered categories were calculated. Three classes of the latter were ordered on a latent continuum “depression,” one class comprises those respondents who exhibit response patterns indicating the artifact mentioned above. Depression is obviously overestimated for these respondents. Connections with age and the Mini-Mental State Examination Score are presented. Results show that care should be taken if the CES-D is employed within a population of the elderly and the sumscore should not be used as a statistic for depression.
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