Prevalence and risk factors of suicidal ideation in adult inpatients with five different types of mental disorders

•In this cross-sectional study, the prevalence of suicidal ideation (SI) was 12.3%.•The prevalence of SI varied among inpatients with five types of mental disorders.•The risk factors of SI varied among inpatients with five types of mental disorders.•Distinct suicide prevention policies should be made for mental disorders. Suicide is a major but preventable public health problem in the world. Mental disorders are related to suicide, and can predict suicidal ideation (SI). This study aims to compare the differences in the prevalence and risk factors of SI among patients with five types of mental disorders. This study involved adult inpatients with five types of mental disorders in Beijing Anding Hospital. Text mining was used to extract information from the electronic medical records. We performed the Pearson's Chi-square analysis and multivariable unconditional logistic regression to filter factors to assess odds of SI for each type of mental disorders. Of the 21,287 participants included, 2,619 had experienced SI. For both sexes, the highest risk of SI was found for patients with recurrent depressive disorder (OR = 7.096; P