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  • Title: Measuring posttraumatic stress following childbirth: a critical evaluation of instruments.
    Author: Stramrood CA, Huis In 't Veld EM, Van Pampus MG, Berger LW, Vingerhoets AJ, Schultz WC, Van den Berg PP, Van Sonderen EL, Paarlberg KM.
    Journal: J Psychosom Obstet Gynaecol; 2010 Mar; 31(1):40-9. PubMed ID: 20146642.
    Abstract:
    OBJECTIVES: To evaluate instruments used to assess posttraumatic stress disorder (PTSD) following childbirth with both quantitative (reliability analysis and factor analysis) and qualitative (comparison of operationalization) techniques. METHODS: An unselected population of 428 women completed the Traumatic Event Scale-B (TES-B) and the PTSD Symptom Scale-Self Report (PSS-SR) 2-6 months after delivery. RESULTS: Assessment of internal consistency yielded similar results for the TES-B and PSS-SR (Cronbach's alpha = 0.87 and 0.82, respectively). Factor analysis revealed two rather than three DSM-IV symptom categories for both instruments: childbirth-related factors (re-experiencing/ avoidance) and symptoms of depression and anxiety (numbing/hyperarousal). Although the TES-B and the PSS-SR sum-scores show a strong relationship (Spearmans rho = 0.78), agreement between the instruments on the identification of PTSD cases is low (kappa = 0.24); discrepancy between TES-B and PSS-SR is largely due to differences in instruction to respondents, formulation of items, answer categories, and cut-off values. CONCLUSIONS: Large operationalization differences between TES-B and PSS-SR have been identified, i.e., in the formulation of questions, answer categories, cut-off values and instructions to respondents. Comparison between studies using different instruments for measuring PTSD following childbirth should be done with utmost caution.
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