Relationship between nightmare distress and depressive symptoms in Chinese emergency department nurses: A cross-sectional study

Table 3 Independent variables in multivariate regression analysis

Independent variable	Code
Gender	Male = 1, female = 2
Education level	Associate degree = 1, bachelor’s degree = 2, graduate degree or above = 3
Years of work	< 1 year = 1, 1-5 years = 2, 6-10 years = 3, > 10 years = 4
Monthly income	< 5000 = 1, 5000-10000 = 2, > 10000 = 3
Work pressure	None = 1, mild = 2, moderate = 3, severe = 4
Self-reported health	Poor = 1, average = 2, good = 3
Province	Jiangxi = 1, Sichuan = 2, Jiangsu = 3, Shanxi = 4, Guangdong = 5, Shaanxi = 6, Hainan = 7, Zhejiang = 8, Hebei = 9