9, Posttraumatic stress disorder (PTSD) following 9/11. Levitt, Malta, Martin, D

Question

9, Posttraumatic stress disorder (PTSD) following 9/11. Levitt, Malta, Martin, Davis, and Cloitre (2007) evaluated the effectiveness of cognitive behavioral therapy (CBT) for treating PTSD and related symptoms for sarvivors of the 9/11 ter- rorist attacks on the Trade Center (WTC) They used a pretest-sirest design to see if CBT was successful at reducing the symptoms of PTSD and related symptoms of depression. They used the Modified PTSD Symptom Scale3 Self-Report (MPSS-SR) questionnaire to mea- sure symptoms of PTSD and the Beck Depres- sion Inventory (BDI) self-report questionnaire

Explanation / Answer

b).

MPSS-SR completed by more paricipants.

paired t test is used, Degrees of freedom =n-1.

Degrees of freedom for MPSS-SR=37, therefore n=38

Degrees of freedom for BDI=34, therefore n=35

c).

Yes, in both tests there is significant decrese in scores at 0.01 level.

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