A computerized, self-administered questionnaire to evaluate posttraumatic stress among firefighters after the World Trade Center collapse.

Objectives: We sought to determine the frequency of psychological symptoms and elevated posttraumatic stress disorder (PTSD) risk among New York City firefighters after the World Trade Center (WTC) attack and whether these measures were associated with Counseling Services Unit (CSU) use or mental health-related medical leave over the first 2.5 years after the attack.

Methods: Shortly after the WTC attack, a computerized, binary-response screening questionnaire was administered.