The impact of an IUD and implant intervention on dual method use among young women: Results from a cluster randomized trial

Abstract Long-acting reversible contraceptives ( LARCs ) are highly effective at preventing pregnancy but do not protect against sexually transmitted infection (STI). Recent efforts to improve access to intrauterine devices (IUDs) and implants have raised concerns about STI prevention and reduced condom use, particularly among teenagers and young women. We evaluated whether a provider-targeted intervention to increase LARC access negatively impacted dual method use and STI incidence among an at-risk patient population. We conducted a cluster randomized trial in 40 reproductive health centers across the United States from May 2011 to May 2013. After training providers at 20 intervention sites, we recruited 1 500 sexually-active women aged 18–25 years who did not desire pregnancy and followed them for one year. We assessed intervention effects on dual method use, condom use and STI incidence, modeling dual method use with generalized estimating equations and STI incidence with Cox proportional hazard regression models, accounting for clustering. We found no differences between intervention and control groups in dual method use (14.3% vs. 14.4%, aOR 1.03, 95% CI 0.74–1.44) or condom use (30% vs. 31%, aOR 1.03, 95% CI 0.79–1.35) at last sex at one year. STI incidence was 16.5 per 100 person-years and did not differ between intervention and control groups (aHR 1.20, 95% CI 0.88–1.64). A provider training intervention to increase LARC access neither compromised condom use nor increased STI incidence among young women. Dual method use was very low overall, highlighting the need to bolster STI prevention efforts among adolescents and young women.