Rates of remission were examined in two controlled 12-week studies of sertraline 
and placebo for post-traumatic stress disorder (PTSD). The performance of three 
scales was evaluated: the self-rated Davidson Trauma Scale (DTS), and two 
interviewer scales: the Clinician Administered PTSD Scale (CAPS) and Clinical 
Global Impressions (CGI). Sertraline proved significantly superior to placebo 
with respect to remission on all three ratings. Rates of remission were very 
similar for all scales, ranging from 23.1-26.3% for sertraline and 13.9-14.9% 
for placebo. Traditional thresholds for the CAPS and DTS were tested relative to 
the CGI and to each other. The CAPS and DTS thresholds of < 20 and < 18 were 
found to be valid.