Fentanyl overdose deaths in Los Angeles have increased 1,280% over the past five years, with white residents accounting for the highest number, according to a new study.

Deaths were highest among adults aged 26 to 39 who live in affluent areas, followed by the age range of 40 to 64, the Los Angeles County Department of Public Health reported. The study looked at deaths, emergency room visits, and hospitalizations broken down by region, age, gender, and ethnicity.