Abstract
Introduction
A study was conducted in three districts in Hai Phong province, Vietnam to estimate the population size of the Female Sex Workers (FSW) in June–July 2019.
Methods
The procedures included selection of three districts, compilation of a list of accessible venues where FSW congregate, distribution of first unique objects (first capture) and second unique objects (second capture) to FSW in randomly selected venues and implementation of a Mini-Respondent Driven Sampling (mRDS) Survey (third capture). Population size of the FSW was calculated based on the number of FSW in each round, number of FSW ‘recaptured’ during the second and the third captures. Additionally, personal network size data captured in the mRDS was used to measure the population of FSW within the three districts using Successive Sampling Population Size Estimates (SS-PSE).
Results
The total estimated FSWs in the three selected districts, using Three Source Capture–Recapture (3S-CRC) was 958, which is slightly lower than that estimated using SS-PSE – 1192. The 3S-CRC method yielded a provincial estimate of 1911 while the SS-PSE method resulted in a total of 2379 FSW for the province.
Conclusion
Two techniques produced different PSE at both the district and the province levels and resulted in estimates lower than ones produced using programmatic data. For planning HIV prevention and care service needs among all FSWs, additional studies are needed to estimate the number of sex workers who are not venue-based and use social media platforms to sell services.
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References
Vietnam Administration for HIV/AIDS Control, Ministry of Health. National HIV sentinel surveillance. Circular 09. 2018. Available from: http://vaac.gov.vn/vanban_detail/Detail/ Thong-tu-09-2012-BYT-TT-cua-Bo-Y-te-Huong-dan-giam-sat-dich-te-hoc-HIV-AIDS-va-giam-sat-cac-nhiem-trung-lay-truyen-qua-duong-tinh-duc.
Vietnam Administration of HIV/AIDS Control (VAAC). The PEPFAR Vietnam Country Operational Plan (COP). 2020. Available from: https://www.state.gov/wp-content/uploads/2020/07/COP-2020-Vietnam-SDS-Final-.pdf.
Huber J, France NF, Nguyen VA, Nguyen HH, Oanh KTH, Bryne E. Exploring beliefs and experiences underlying self-stigma among sex workers in Hanoi, Vietnam. Cult Health Sexual 2019;21;1425–38.
Vietnam Administration for HIV/AIDS Control, Ministry of Health. The Asian Epidemic Model. 2019 [Unpublished data].
General Statistics Office of Vietnam (GSO). General Statistics Office in Hai Phong. 2019 report. Available from: https:// thongkehaiphong.gov.vn/nien-giam-thong-ke/.
Vietnam Administration for HIV/AIDS Control, Ministry of Health. National Program Data. Circular 03. 2018. Available from: http://vaac.gov.vn/vanban_detail/Detail/Thong-tu-03-2015-TT-BYT-ve-viec-Quy-dinh-che-do-bao-cao-cong-tac-phong-chong-HIV-AIDS.
Des Jarlais D, Khue PM, Feelemyer J, Arasteh K, Huong DT, Oanh KTH, et al. Using dual capture/recapture studies to estimate the population size of persons who inject drugs (PWID) in the city of Hai Phong, Vietnam. Drug Alcohol Depend 2018;185;106–11.
Son VH, Safarnejad A, Nga NT, Linh VM, Tu LTC, Manh PD, et al. Estimation of the population size of men who have sex with men in Vietnam: social app multiplier method. JMIR Public Health Surveill 2019;5;e12451.
Vuylsteke B, Vandenhoudt H, Langat L, Semde G, Menten J, Odongo F, et al. Capture–recapture for estimating the size of the female sex worker population in three cities in Côte d’Ivoire and in Kisumu, western Kenya. Trop Med Int Health 2010;15;1537–43.
Thandrayen J, Wang Y. Capture–recapture analysis with a latent class model allowing for local dependence and observed heterogeneity. Biom J 2010;52;552–61.
Doshi RH, Apodaca K, Ogwal M, Bain R, Amene E, Kiyingi H, et al. Estimating the size of key populations in Kampala, Uganda: 3-source capture-recapture study. JMIR Public Health Surveill 2019;5;e12118.
Okiria AG, Bolo A, Achut V, Arkangelo GC, Michael ATI, Katoro JS, et al. Novel approaches for estimating female sex worker population size in conflict-affected South Sudan. JMIR Public Health Surveill 2019;5;e11576.
WHO, CDC, UNAIDS, FHI 360. Biobehavioral survey guidelines for populations at risk for HIV. Geneva: World Health Organization; 2017.
Heckathorn DD. Respondent-driven sampling II: deriving valid population estimates from chain-referral samples of hidden populations. Soc Probl 2002;49;11–34.
Manrique-Vallier D. Bayesian population size estimation using Dirichlet process mixtures. Biometrics 2016;72;1246–54.
Handcock MS, Gile KJ, Mar CM. Estimating hidden population size using Respondent-Driven Sampling data. Electron J Statist 2014;8;1491–521.
McLaughlin KR, Johnston LG, Gamble LJ, Grigoryan T, Papoyan A, Grigoryan S. Population size estimations among hidden populations using respondent-driven sampling surveys: case studies from Armenia. JMIR Public Health Surveill 2019;5;e12034.
Appota. Vietnam mobile app market report – First half of 2018. Available from: https://appota.com/uploads/report/Vietnam_mobile_ app_market_Report_2018_EN.pdf.
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Data availability statement: The datasets generated during and/or analyzed during the current study are available from the corresponding author [LTN], on reasonable request.
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Nguyen, L.T., Patel, S., Nguyen, N.T. et al. Population Size Estimation of Female Sex Workers in Hai Phong, Vietnam: Use of Three Source Capture-Recapture Method. J Epidemiol Glob Health 11, 194–199 (2021). https://doi.org/10.2991/jegh.k.210312.001
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DOI: https://doi.org/10.2991/jegh.k.210312.001