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Respondent driven sampling

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https://www.readbyqxmd.com/read/28328550/injection-drug-network-characteristics-are-important-markers-of-hiv-risk-behavior-and-lack-of-viral-suppression
#1
Javier A Cepeda, Sunil S Solomon, Aylur K Srikrishnan, Allison M McFall, M Suresh Kumar, Canjeevaram K Vasudevan, Santhanam Anand, David D Celentano, Gregory M Lucas, Shruti H Mehta
BACKGROUND: People who inject drugs (PWID) who are highly connected within their injection drug networks may be important HIV transmission nodes if they frequently share syringes with other PWID and are not engaged in HIV care. In India, HIV transmission fueled by injection drug use is increasing, however little is known about the associations between injection network size and syringe sharing and viral suppression. METHODS: We recruited 14,481 PWID between October 2012 - December 2013 by respondent driven sampling across 15 sites in India...
March 20, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28325068/the-relationship-between-health-worker-stigma-and-uptake-of-hiv-counseling-and-testing-and-utilization-of-non-hiv-health-services-the-experience-of-male-and-female-sex-workers-in-kenya
#2
Laura Nyblade, Aditi Reddy, David Mbote, John Kraemer, Melissa Stockton, Caroline Kemunto, Karol Krotki, Javier Morla, Stella Njuguna, Arin Dutta, Catherine Barker
The barrier HIV-stigma presents to the HIV treatment cascade is increasingly documented; however less is known about female and male sex worker engagement in and the influence of sex-work stigma on the HIV care continuum. While stigma occurs in all spheres of life, stigma within health services may be particularly detrimental to health seeking behaviors. Therefore, we present levels of sex-work stigma from healthcare workers (HCW) among male and female sex workers in Kenya, and explore the relationship between sex-work stigma and HIV counseling and testing...
March 22, 2017: AIDS Care
https://www.readbyqxmd.com/read/28317210/epidemiology-of-hiv-and-hepatitis-c-infection-among-women-who-inject-drugs-in-northeast-india-a-respondent-driven-sampling-study
#3
Allison M Mcfall, Sunil S Solomon, Greg M Lucas, David D Celentano, Aylur K Srikrishnan, Muniratnam S Kumar, Shruti H Mehta
BACKGROUND AND AIMS: Despite extensive research on HIV and hepatitis C (HCV) among people who inject drugs (PWID), there remains a gap in knowledge on the burden among women who inject drugs and their unique contexts and risk factors. This analysis compares HIV and HCV prevalence in female and male PWID and estimates injection and sexual risk correlates of prevalent HIV and HCV infection among women in Northeast India. DESIGN: Cross-sectional sample accrued using respondent-driven sampling...
March 20, 2017: Addiction
https://www.readbyqxmd.com/read/28299864/robust-inference-of-genetic-architecture-in-mapping-studies
#4
Jon Slate
The genetic architecture of a trait usually refers to the number and magnitude of loci that explain phenotypic variation. A description of genetic architecture can help us to understand how genetic variation is maintained, how traits have evolved and how phenotypes might respond to selection. However, linkage mapping and association studies can suffer from problems of bias, especially when conducted in natural populations where the opportunity to perform studies with very large sample sizes can be limited. In this issue of Molecular Ecology, Li and colleagues perform an association study of brain traits in ninespine sticklebacks Pungitius pungitius...
March 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28283493/process-evaluation-of-the-data-driven-quality-improvement-in-primary-care-dqip-trial-case-study-evaluation-of-adoption-and-maintenance-of-a-complex-intervention-to-reduce-high-risk-primary-care-prescribing
#5
Aileen Grant, Tobias Dreischulte, Bruce Guthrie
OBJECTIVE: To explore how different practices responded to the Data-driven Quality Improvement in Primary Care (DQIP) intervention in terms of their adoption of the work, reorganisation to deliver the intended change in care to patients, and whether implementation was sustained over time. DESIGN: Mixed-methods parallel process evaluation of a cluster trial, reporting the comparative case study of purposively selected practices. SETTING: Ten (30%) primary care practices participating in the trial from Scotland, UK...
March 10, 2017: BMJ Open
https://www.readbyqxmd.com/read/28273077/prevalence-of-condomless-anal-intercourse-and-recent-hiv-testing-and-their-associated-factors-among-men-who-have-sex-with-men-in-hangzhou-china-a-respondent-driven-sampling-survey
#6
Runhua Li, Hui Wang, Xiaohong Pan, Qiaoqin Ma, Lin Chen, Xin Zhou, Tingting Jiang, Lin He, Junfang Chen, Xingliang Zhang, Yan Luo, Shengjun Xi, Xin Lv, Shichang Xia
Men who have sex with men (MSM) are a large high-risk population for HIV infection in recent years in China. A cross-sectional survey was conducted in Hangzhou, China, to determine rates of condomless anal intercourse (CAI), recent HIV testing (in the recent year) and associated factors using respondent-driven sampling. Questionnaires using face-to-face interviews were employed to collect data on sexual risk behaviors and HIV testing. Five hundred eleven MSM were recruited, of which 459 (89.8%) had anal intercourse in the past 6 months...
2017: PloS One
https://www.readbyqxmd.com/read/28271018/hepatitis-c-serosorting-among-people-who-inject-drugs-in-rural-puerto-rico
#7
Ian Duncan, Ric Curtis, Juan Carlos Reyes, Roberto Abadie, Bilal Khan, Kirk Dombrowski
Due to the high cost of treatment, preventative measures to limit Hepatitis C (HCV) transmission among people who inject drugs (PWID) are encouraged by many public health officials. A key one of these is serosorting, where PWID select risk partners based on concordant HCV status. Research on the general U.S. population by Smith et al. (2013) found that knowledge of one's own HCV status facilitated serosorting behaviors among PWID, such that respondents with knowledge of their own status were more likely to ask potential partners about their status prior to sharing risk...
June 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28267698/public-health-benefit-of-peer-referral-strategies-for-detecting-undiagnosed-hiv-infection-among-high-risk-heterosexuals-in-new-york-city
#8
Marya Gwadz, Charles M Cleland, David C Perlman, Holly Hagan, Samuel M Jenness, Noelle R Leonard, Amanda S Ritchie, Alexandra Kutnick
Identifying undiagnosed HIV infection is necessary for the elimination of HIV transmission in the United States. The present study evaluated the efficacy of 3 community-based approaches for uncovering undiagnosed HIV among heterosexuals at high-risk (HHR), who are mainly African American/Black and Hispanic. Heterosexuals comprise 24% of newly reported HIV infections in the United States, but experience complex multilevel barriers to HIV testing. We recruited African American/Black and Hispanic HHR in a discrete urban area with both elevated HIV prevalence and poverty rates...
April 15, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28265637/structural-origin-of-the-enhanced-ionic-conductivity-upon-nb-doping-in-sr11mo4o23-defective-double-perovskite
#9
C D Miranda, C A López, J C Pedregosa, J A Alonso
We report a substantial enhancement of the oxide-ion conductivity in Sr11Mo4O23 achieved by Nb doping the Mo sites. This series responds to the formula: Sr11Mo4-xNbxO23-δ (with x = 0.0, 0.5 and 1.0). The original structure can be related to the conventional double perovskite; however, it presents a broken corner sharing connectivity of the octahedral framework, hence leading to a complex and highly defective network. The samples were prepared via citrate precursor method, followed by thermal treatments at 1300 °C for 12 hours in air...
March 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28257143/modeling-and-analyzing-respondent-driven-sampling-as-a-counting-process
#10
Yakir Berchenko, Jonathan D Rosenblatt, Simon D W Frost
Respondent-driven sampling (RDS) is an approach to sampling design and analysis which utilizes the networks of social relationships that connect members of the target population, using chain-referral. RDS sampling will typically oversample participants with many acquaintances. Naïve estimators, such as the sample average, will thus be biased towards the state of the most highly connected individuals. Current methodology cannot estimate population size from RDS, and promotes inverse probability weighted estimators for population parameters such as HIV prevalence...
March 3, 2017: Biometrics
https://www.readbyqxmd.com/read/28256422/geographical-disparities-in-hiv-prevalence-and-care-among-men-who-have-sex-with-men-in-malawi-results-from-a-multisite-cross-sectional-survey
#11
Andrea L Wirtz, Gift Trapence, Dunker Kamba, Victor Gama, Rodney Chalera, Vincent Jumbe, Rosemary Kumwenda, Marriam Mangochi, Stephane Helleringer, Chris Beyrer, Stefan Baral
BACKGROUND: Epidemiological assessment of geographical heterogeneity of HIV among men who have sex with men (MSM) is necessary to inform HIV prevention and care strategies in the more generalised HIV epidemics across sub-Saharan Africa, including Malawi. We aimed to measure the HIV prevalence, risks, and access to HIV care among MSM across multiple localities to better inform HIV programming for MSM in Malawi. METHODS: Between Aug 1, 2011, and Sept 13, 2014, we recruited MSM into cross-sectional research via respondent-driven sampling (RDS) in seven districts of Malawi...
February 27, 2017: Lancet HIV
https://www.readbyqxmd.com/read/28245152/real-world-use-and-self-reported-health-outcomes-of-a-patient-designed-do-it-yourself-mobile-technology-system-for-diabetes-lessons-for-mobile-health
#12
Joyce M Lee, Mark W Newman, Achamyeleh Gebremariam, Preciosa Choi, Dana Lewis, Weston Nordgren, John Costik, James Wedding, Benjamin West, Nancy Benovich Gilby, Christopher Hannemann, Josh Pasek, Ashley Garrity, Emily Hirschfeld
BACKGROUND: The aim of this study is to compare demographic/disease characteristics of users versus nonusers of a do-it-yourself (DIY) mobile technology system for diabetes (Nightscout), to describe its uses and personalization, and to evaluate associated changes in health behaviors and outcomes. METHODS: A cross-sectional, household-level online survey was used. Of 1268 household respondents who were members of the CGM in the Cloud Facebook group, there were 1157 individuals with diabetes who provided information about Nightscout use...
February 28, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/28243868/sexual-identity-stigma-and-depression-the-role-of-the-anti-gay-propaganda-law-in-mental-health-among-men-who-have-sex-with-men-in-moscow-russia
#13
Emily Hylton, Andrea L Wirtz, Carla E Zelaya, Carl Latkin, Alena Peryshkina, Vladmir Mogilnyi, Petr Dzhigun, Irina Kostetskaya, Noya Galai, Chris Beyrer
Depression is a major public health problem in the Russian Federation and is particularly of concern for men who have sex with men (MSM). MSM living in Moscow City were recruited via respondent-driven sampling and participated in a cross-sectional survey from October 2010 to April 2013. Multiple logistic regression models compared the relationship between sexual identity, recent stigma, and probable depression, defined as a score of ≥23 on the Center for Epidemiological Studies Depression scale. We investigated the interactive effect of stigma and participation in the study after the passage of multiple "anti-gay propaganda laws" in Russian provinces, municipalities, and in neighboring Ukraine on depression among MSM...
February 27, 2017: Journal of Urban Health: Bulletin of the New York Academy of Medicine
https://www.readbyqxmd.com/read/28238172/local-versus-landscape-spatial-influence-on-biodiversity-a-case-study-across-five-european-industrialized-areas
#14
E Piano, M Isaia, E Falasco, V La Morgia, G Soldato, F Bona
Land use change-mostly habitat loss and fragmentation-has been recognized as one of the major drivers of biodiversity loss worldwide. According to the habitat amount hypothesis, these phenomena are mostly driven by the habitat area effect. As a result, species richness is a function of both the extent of suitable habitats and their availability in the surrounding landscape, irrespective of the dimension and isolation of patches of suitable habitat. In this context, we tested how the extent of natural areas, selected as proxies of suitable habitats for biodiversity, influences species richness in highly anthropogenic landscapes...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28238119/use-of-pre-exposure-prophylaxis-prep-in-young-men-who-have-sex-with-men-is-associated-with-race-sexual-risk-behavior-and-peer-network-size
#15
Lisa M Kuhns, Anna L Hotton, John Schneider, Robert Garofalo, Kayo Fujimoto
Pre-exposure prophylaxis (PrEP) is efficacious to prevent HIV infection, however, uptake among young men who have sex with men (YMSM) is relatively low. The purpose of this study was to describe PrEP use and related factors in a representative sample of YMSM in two cities, Chicago and Houston. YMSM, ages 16-29, were recruited via respondent-driven sampling (RDS) from 2014 to 2016. Correlates of PrEP uptake were assessed in weighted multivariable logistic regression models. A total of 12.2% of participants (of 394) reported ever taking PrEP; Black YMSM had the lowest rates of uptake (4...
February 25, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28235839/sexual-partner-characteristics-and-incident-rectal-neisseria-gonorrhoeae-and-chlamydia-trachomatis-infections-among-gay-men-and-other-men-who-have-sex-with-men-msm-a-prospective-cohort-in-abuja-and-lagos-nigeria
#16
Habib O Ramadhani, Hongjie Liu, Rebecca G Nowak, Trevor A Crowell, Teclaire Ndomb, Charlotte Gaydos, Sheila Peel, Nicaise Ndembi, Stefan D Baral, Julie Ake, Man E Charurat
BACKGROUND: STIs including Neisseria gonorrhoeae (NG) and Chlamydia trachomatis (CT) potentiate HIV acquisition and transmission especially among gay men and other men who have sex with men (MSM). We investigated the influence of sexual network composition on incident rectal NG and/or CT infections among Nigerian MSM. METHODS: TRUST/RV368 is a cohort of MSM recruited using respondent-driven sampling at trusted community centres in Abuja and Lagos, Nigeria. MSM respondents (egos) provided STI risk factors and demographic information for up to five of their most recent sexual partners (alters) within their sexual networks...
February 24, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/28231134/motivations-for-food-consumption-during-specific-eating-occasions-in-turkey
#17
Delores Chambers, Uyen T X Phan, Sirichat Chanadang, Curtis Maughan, Karolina Sanchez, Brizio Di Donfrancesco, David Gomez, Federica Higa, Han Li, Edgar Chambers, Eyyup Esen
Several studies in different countries have been conducted to investigate factors affecting food choices. The objective of this study was to understand the motivations of specific food and beverage choices for different eating occasions in a typical diet of the Turkish people. A convenience sample of 141 respondents from seven different geographical regions in Turkey completed an online survey questionnaire that included questions about demographic information and details about their latest eating occasion...
May 24, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28202736/hiv-and-sti-s-among-men-who-have-sex-with-men-in-dodoma-municipality-tanzania-a-cross-sectional-study
#18
Elia John Mmbaga, Kåre Moen, Neema Makyao, Rose Mpembeni, Melkizedeck T Leshabari
OBJECTIVES: To determine the seroprevalence of HIV, STI and related risks among men who have sex with men (MSM) in Dodoma municipality, Tanzania. METHODS: A cross-sectional study using respondent-driven sampling was employed to recruit study participants aged 18 years and above. Data on sociodemographics, HIV/STI knowledge and sexual practices were collected. Blood samples were tested for HIV and selected STIs. RESULTS: A total of 409 participants aged from 18 to 60 years took part in this study...
February 15, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/28188030/unveiling-of-hiv-dynamics-among-transgender-women-a-respondent-driven-sampling-study-in-rio-de-janeiro-brazil
#19
Beatriz Grinsztejn, Emilia M Jalil, Laylla Monteiro, Luciane Velasque, Ronaldo I Moreira, Ana Cristina F Garcia, Cristiane V Castro, Alícia Krüger, Paula M Luz, Albert Y Liu, Willi McFarland, Susan Buchbinder, Valdilea G Veloso, Erin C Wilson
BACKGROUND: The burden of HIV in transgender women (transwomen) in Brazil remains unknown. We aimed to estimate HIV prevalence among transwomen in Rio de Janeiro and to identify predictors of newly diagnosed HIV infections. METHODS: We recruited transwomen from Rio de Janeiro, Brazil, by respondent-driven sampling. Eligibility criteria were self-identification as transwomen, being 18 years of age or older, living in Rio de Janeiro or its metropolitan area, and having a valid peer recruitment coupon...
February 7, 2017: Lancet HIV
https://www.readbyqxmd.com/read/28169873/physical-and-sexual-violence-affecting-female-sex-workers-in-abidjan-c%C3%A3-te-d-ivoire-prevalence-and-the-relationship-between-violence-the-work-environment-hiv-and-access-to-health-services
#20
Carrie Lyons, Sosthenes Ketende, Fatou Drame, Ashley Grosso, Daouda Diouf, Ibrahima Ba, Kate Shannon, Rebecca Ezouatchi, Amara Bamba, Abo Kouame, Stefan Baral
BACKGROUND: Violence is a human rights violation, and an important measure in understanding HIV among female sex workers (FSW). However, limited data exist regarding correlates of violence among FSW in Côte d'Ivoire. Characterizing prevalence and determinants of violence and the relationship with structural risks for HIV can inform development and implementation of comprehensive HIV prevention and treatment programs. METHODS: FSW > 18 years were recruited through respondent driven sampling (RDS) in Abidjan, Côte d'Ivoire...
February 6, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
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