H&H Timeline

H&H Study Timeline

2013-2014
H&H Study was Implemented

3,396 students across 10 Los Angeles public high schools enrolled at baseline to complete their first survey in 9th grade.

2013-2017
Survey Follow-ups

Follow-up surveys were conducted every six months, for a total of 8 waves of data collection. Throughout high school, the H&H Study had over 95% retention rate.

2017
Participants Graduate High School!

After graduation, we proceed to survey students into emerging adulthood.

2018
H&H Wave 9 

First follow-up survey after high school. Online data collection post-grad occurs twice a year.

2021
Today
Currently

The H&H study is on Wave 12 of data collection, and will continue until 2023.

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University of Southern California
Epidemiology of Substance Use (EOS)
Department of Population and Public Health Sciences

Soto Street Building, 3rd Floor 
1845 N Soto St
Los Angeles, CA 90032