Substance use and associated factors among preparatory school students in Kolfe-Keranyo sub-city of Addis Ababa, Ethiopia.

"Declarations Ethics approval and consent to participateEthical clearance was obtained from the ethical review committee of Addis Ababa Business and Medical College and an official letter was submitted to Kolfe Keranyo sub-city education office. Permission letter was also obtained from the sub-city education and health offices and sent to each identified schools. There were no risks due to participation in the research project, and the collected data were used only for research purposes. Verbal informed consent was obtained from the students the information collected from each respondent was kept with complete confidentiality. Consent for publicationThis manuscript does not contain any individual person’s data. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding Authors did not receive fund from funding organizations."