Individual Study / Duncan et al.; PLoS One. 2016

A P18 Cohort Sub-Study

A P18 Cohort Sub-Study

Initiatives -
The purpose of this study was to evaluate the feasibility and acceptability of using GPS methods to understand the spatial context of substance use and sexual risk behaviors among a sample of YMSM in New York City, a high-risk population. Note: All published information has been collected from the article referenced in the Marker Paper box below. Therefore, there may be variations with more advanced versions of the study.
Start Year
This work was supported by the NYUCenter for Drug Use and HIV Research Pilot ProjectAwards Program (Drs. Dustin Duncan and FarzanaKapadia, co-Principal Investigators). The NYU Center or Drug Use and HIV Research is funded by theNational Institute on Drug Abuse (Grant#5P30DA011041-17). The parent study, Project 18,was also funded by the National Institute on DrugAbuse (Grant # 1R01DA025537; 2R01DA025537-06A1, Dr. Perry Halkitis, Principal Investigator)


Study design
Population cohort

Marker Paper

Duncan DT, Kapadia F, Regan SD, et al. Feasibility and Acceptability of Global Positioning System (GPS) Methods to Study the Spatial Contexts of Substance Use and Sexual Risk Behaviors among Young Men Who Have Sex with Men in New York City: A P18 Cohort Sub-Study. PLoS One. 2016;11(2):e0147520. Published 2016 Feb 26. doi:10.1371/journal.pone.0147520

PUBMED 26918766


Sources of Recruitment
  • Individuals

Number of participants

Number of participants
Number of participants with biosamples


Availability of data and biosamples




The participants were eligible for this study if they were 18 or 19 years old, biologically male, lived in the New York City metropolitan area, reported having had sex (any physical contact that could lead to orgasm) with another male in the 6 months preceding screening, and self-reported a HIV-negative or unknown ser-ostatus. P18 participants predominantly lived in one of the New York City boroughs (69%). Our goal was to recruit 25 Black men, 25 Hispanic men and 25 White men to participate in this study.
Selection Criteria
Minimum age
Maximum age
  • United States of America
New York City
Ethnic Origin
Health Status


Sources of recruitment
  • General population

Number of participants

Number of participants
Number of participants with biosamples
Data Collection Event
To achieve this sample, we emailed n = 200 active study participants of which n = 82 individuals called in to be screened, n = 81 were screened, andn = 75 were scheduled to come in to obtain their GPS devices and take a brief GPS feasibilitysurvey and a survey on perceived neighborhood characteristics (e.g., exposure to neighborhood crime, neighborhood social norms about drug use and sex/HIV and gay friendliness of theneighborhood).
Start Date
End Date
Data sources
  • Geospatial technology
    • Global navigation satellite systems (GNSS) (e.g. GPS, GLONASS, Galileo, etc.)