Gates Open Research Open Peer Review Any reports and responses or comments on the article can be found at the end of the article. RESEARCH ARTICLE Emerging trends in contraceptive use, transitions and preferences among female sex workers screened for an HIV prevention clinical trial in Kisumu, Kenya: a cross-sectional study [version 1; peer review: awaiting peer review] Dismas Oketch , Eunice C. Kaguiri , Joseph O. Orinda , Grace Mboya , Phoebe Ogutu , Richard Lando , Carolyne Juma , Richard Ndivo , Daniel O. Ontieri , Philister A. Madiega , Fredrick Oloo , Jecinter Oruko , Rosemary Akello , Kelvin Wandera , Evans Odipo , Elizabeth Greene , Philip Andrew , Victor Mudhune , Victor Akelo 1 Center for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya School of Medicine, Moi University, Eldoret, Kenya Science Facilitation, Family Health International, Durham, North Carolina, USA Abstract Globally about 210 million women conceive annually and Background: 38% of these pregnancies are unintended. Female sex workers (FSWs) are at increased risk of both unintended pregnancy and acquiring HIV, which could lead to adverse sexual and reproductive health (SRH) outcomes. We sought to assess contraceptive use or non-use, preferences and determinants among a cohort of FSWs screened for an HIV prevention clinical trial in Kisumu, Kenya. A cross sectional study of healthy FSWs referred for possible Methods: recruitment into the Antibody Mediated HIV Prevention (AMP) Study was conducted between December 2016 and September 2018. Potentially eligible participants were screened for HIV and data on social-demographic, contraceptive use and other SRH characteristics were collected. Those not on a method recorded their contraceptive preferences. Data on 210 FSWs with a median age of 24.5 years (interquartile Results: range, IQR 22-26) are presented. Of these, 187 (89.1%) had two children or fewer; only 56 (26.7%) had completed secondary or higher education. At the time of the interview, 18 (8.6%) were HIV-infected and 181 (86.2%) were using a modern contraceptive. Implants (48.6%) and depot injections (37.6%) were the most commonly used methods. Most (41.4%) of those not on family planning preferred oral pills. Respondents who had two or more children were three times more likely than their primiparous and nulliparous counterparts to report use of a contraceptive. Use of modern contraception methods did not differ by respondent’s ownership of a medical insurance 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 1 1 1 2 3 Reviewer Status AWAITING PEER REVIEW 05 Jul 2019, :1505 ( First published: 3 ) https://doi.org/10.12688/gatesopenres.13000.1 05 Jul 2019, :1505 ( Latest published: 3 ) https://doi.org/10.12688/gatesopenres.13000.1 v1 Page 1 of 9 Gates Open Research 2019, 3:1505 Last updated: 05 JUL 2019