| Objective To understand the relationship between negative air ions concentration and common mental disorders which helped to explore the influence of air ions concentration on common mental disorders. Methods Patients with schizophrenia,mental retardation and bipolar disorder who were hospitalized in The Third People's Hospital of Zhongshan from June 2010 to May 2017 were selected as subjects. All medical records of these subjects were collected and analyzed. Correlation analysis between the monthly admission of each disease and the average monthly air negative ion concentration was performed. Results Pearson correlation analysis showed that monthly admission of bipolar depression was positively correlated with negative air ions concentration ( r = 0. 34,P < 0. 01 ) . The monthly concentration of negative air ions from January to December were 353, 336, 419, 564, 658, 729, 700, 665,637, 512, 393, 479, and the cumulative admission of bipolar depression in the corresponding month were 37, 20, 36, 38, 55, 31 ,29, 41 , 44, 38, 26, 37. Conclusion The morbidity of bipolar depression increased at low level of negative air ions concentration but decreased at high level. |