Abstract
Abstract. The Instrument for Stress-Oriented Task Analysis (ISTA, Instrument zur stressbezogenen Taetigkeitsanalyse) is a German, action–theory-based instrument to measure stressors and resources in the workplace. In order to examine the psychometric properties of the ISTA variables, we conducted a meta-analysis using the job demands–resources (JD-R) model for construct validation of the instrument. The meta-analysis consisted of a maximum of 58 independent data sets in 51 studies, of which 26 have been published. Based on 565 individual means and standard deviations, 506 reliabilities, and 4,730 correlation coefficients, meta-analytical information was computed. Overall, the instrument showed good psychometric properties: The scale means were close to the theoretical mean of the scales and reliabilities were acceptable to good. The validation hypotheses were examined by analyzing the correlations of ISTA variables (stressors and resources) with psychological strain and well-being. Our hypotheses were largely supported by the data: Stressors were positively related to strain and mostly negatively related to well-being, while resources were mostly positively related to well-being and partly negatively related to strain. Moderation analyses revealed that the two versions of the ISTA, the publication status, the proportion of women, and the industrial sector of the samples had little systematic impact on the means and reliabilities of most ISTA scales as well as on correlations between ISTA scales and of ISTA scales with scales measuring psychological strain and well-being.
Zusammenfassung. Das Instrument zur stressbezogenen Tätigkeitsanalyse ISTA ist ein handlungstheoretisch fundiertes Instrument zur Erfassung von Stressoren und Ressourcen am Arbeitsplatz. Zur Bestimmung der psychometrischen Eigenschaften der ISTA-Skalen wurde eine Meta-Analyse durchgeführt. Die Meta-Analyse beinhaltete Stichproben von 58 Studien, von denen 26 publiziert waren, mit einer Gesamtstichprobe von N = 12232 Personen. Auf Basis von 565 beobachteten Mittelwerten und Standardabweichungen, 506 Reliabilitätskoeffizienten und 4730 Korrelationskoeffizienten wurden die meta-analytischen Berechnungen durchgeführt. Für die Konstruktvalidierung des Instruments wurde das Job Demands-Resources-Modell verwendet, um die theoretischen Beziehungen zwischen ISTA-Variablen (Stressoren und Ressourcen) mit psychischen Beeinträchtigungen und Wohlbefinden zu untersuchen. Insgesamt zeigte das Instrument gute psychometrische Eigenschaften: Alle Mittelwerte lagen nah am theoretischen Mittel der Skala und die Reliabilitäten der Skalen war akzeptabel bis gut. Die Konstruktvalidierungshypothesen konnten im Wesentlichen durch die Daten gestützt werden: Stressoren korrelierten positiv mit psychischen Beeinträchtigungen und negativ mit Wohlbefinden, während Ressourcen negativ mit psychischen Beeinträchtigungen und positiv mit Wohlbefinden zusammenhingen. Moderatoranalysen zeigten zudem, dass bei den meisten Skalen nur ein geringer systematischer Einfluss der Version des ISTA, des Publikationsstatus, des Anteils an Frauen oder der Branche auf Mittelwerte und Reliabilitäten der ISTA-Skalen sowie auf Korrelationen zwischen den ISTA-Skalen und Korrelationen der ISTA-Skalen mit Skalen zu psychischen Beeinträchtigungen und Wohlbefinden besteht.
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