2.2. Measures

First, the demographic data consisting of gender, age, professional titles, years of working, educational background, marriage status, number of child, duration of shift, precaution measures, previous experience of working with the pandemic outbreak, prior knowledge about COVID-19 as well as the whole working time in this outbreak were collected. Next, the psychological condition of the healthcare nurses working with the COVID-19 patients in different ward was assessed. Basically, the subjects were divided into 2 groups, 1 for the critical care ward (Intensive Care unit (ICU), Respiratory and Critical Care Medicine as well as Infectious Disease) which provide the nursing care mainly consisting of invasive procedure such as mechanical ventilation, and the other 1 for the non-critical care ward (general ward) which provided the medical care for COVID-19 patients with mild symptoms or condition. The questionnaire was modified according to the reported trauma-related evaluation, such as the Traumatic Stress Institute Belief Scale,^[17] Impact of event scale revised (IES-R)^[18] as well as the stress questionnaire^[19] for assessing the psychological disorders and distress in hospital workers. Cronbach's alpha (internal consistency)^[20] for the questionnaire in our study reached 0.94, demonstrating its favorable reliability.