Does substance use disorder treatment completion reduce the risk of treatment readmission in Chile?

•Completing a treatment reduces readmission risk by 17% for the first entry in ambulatory baseline treatments.•Completing a treatment reduces readmission risk by 14% for the second entry in ambulatory baseline treatments.•Treatment completion did not reduce readmission risk among people with residential baseline treatment.•Females have a higher risk of readmission compared to males.•People that use Cocaine and Cocaine Paste tend to have greater readmission risk compared to people that use alcohol.