ypoesis 29. Posttraumatic stress disorder [PTSD) following 9/11. Levitt, Malta,

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, p

Explanation / 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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