ypoesis 29. Posttraumatic stress disorder [PTSD) following 9/11. Levitt, Malta,
ID: 2931666 • Letter: Y
Question
ypoesis 29. Posttraumatic stress disorder [PTSD) following 9/11. Levitt, Malta, Martin, Davis, and Cloitre (2007) evaluated the effectiveness of cogni- tive behavioral therapy [CBT) for treating PTSD d related symptoms for survivors of the 9/11 attacks on the World Trade Center (WTC]. They used a pretest-posttest design to see if CBT was successful at reducing the symptoms of PTSD and related symptoms of depression. They used the Modified PTSD Symptom Scale Self-Report (MPSS-SRI questionnaire to measure symptoms of PTSD and the Beck Depression Inventory IBDI) self-report questionnaire to measure symptoms of depression. For both questionnaires, lower scores indicated fewer symptoms. The authors reported the following results: Pre- to post-treatment t tests for the WTC sample revealed significant decreases in scores on the MPSS-SR, [137 = 12.74, pExplanation / Answer
Test hypothesis in paired t test
HO: pre score -post score =0
H1: pre score -post score >0
Rejection Rule: If P value < .01, we can rejecte null hypothesis and conclud that there is statistically significant difference.
For PTSD score of MPSS-SR is decrease (p value <.01)
Hence we can concluded that CBT was successful in decreasing PTSD
Same in case of depression
Score of BDI is decreased (p value <.01)
Hence we can can concluded that CBT was successful in reducing depression.
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