Objective  To explore the prevalence and influencing factors of posttraumatic stress disorder (PTSD) and depression among enterprise employees after an accident disaster.

  Methods  We conducted a self-administered questionnaire survey among 2 456 employees selected using cluster sampling from 21 enterprises in Tianjin city from October (about two months after an accident disaster) to December 2015. Post-Traumatic Stress Disorder Checklist-Civilian Version (PCL-C), Center Epidemiological Studies of Depression Short Form (CES-D-10), and Connor-Davidson Resilience Scale Short Form (CD-RISC-10) were adopted in the study.

  Results  Among the employees, the overall prevalence rate of PTSD, depression, and PTSD-depression co-morbidity was 20.09%, 28.29%, and 14.36% respectively. Compared to the female employees, the male employees reported significantly higher prevalence rate of PTSD (22.37% vs. 17.27%, χ² = 9.37, P < 0.01) and PTSD-depression co-morbidity (15.87% vs. 12.50%, χ² = 5.33, P < 0.05); but no gender difference was observed in depression prevalence rate (χ² = 1.12, P > 0.05). Logistic regression analysis revealed that impact factors for PTSD, depression and PTSD-depression co-morbidity were physically injured (for PTSD: odds ratio OR=2.430, P < 0.01; for depression: OR = 1.863, P < 0.05; for the co-morbidity: OR = 1.903, P < 0.05), heavy losses caused by the accident (OR = 1.343, P < 0.01; OR = 1.464, P < 0.001; OR = 1.513, P < 0.001), and mental resilience (OR = 0.335; OR = 0.274; OR = 0.275; all P < 0.001).

  Conclusion  For the prevalence of PTSD and depression, physically injured and heavy losses caused by the accident are risk factors and the mental resilience is a protective factor among enterprise employees after the accident disaster.