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Respondent driven sampling

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https://www.readbyqxmd.com/read/28425911/a-response-to-the-use-of-respondent-driven-sampling-in-urban-indigenous-populations
#1
Jenna Osmond
No abstract available.
April 20, 2017: Canadian Journal of Public Health. Revue Canadienne de Santé Publique
https://www.readbyqxmd.com/read/28424999/alcohol-use-exacerbates-acculturative-stress-among-recently-immigrated-young-adult-latinas
#2
Melissa M Ertl, Frank R Dillon, Jessica L Martin, Rosa Babino, Mario De La Rosa
Associations between theorized sociocultural factors and acculturative stress were examined among Latina immigrants (aged 18-23 years) during their initial months in the US. Participants' quantity of alcohol use was hypothesized to be linked with more acculturative stress. Using respondent-driven sampling, 530 Latinas who recently immigrated to Miami-Dade County, Florida, were recruited from community activities, Latino health fairs, advertisements at community agencies, and online postings. A path analysis revealed associations between acculturative stress and more time in the US and greater commitment to ethnic identity...
April 19, 2017: Journal of Immigrant and Minority Health
https://www.readbyqxmd.com/read/28411424/drug-use-among-transgender-people-in-ontario-canada-disparities-and-associations-with-social-exclusion
#3
Ayden I Scheim, Greta R Bauer, Mostafa Shokoohi
INTRODUCTION: We identified the prevalence and correlates of past-year illicit drug use among transgender people in Ontario, Canada, and disparities with the age-standardized non-transgender population. METHODS: Data on transgender persons aged 16+ (n=406) were obtained from Trans PULSE, a respondent-driven sampling (RDS) survey (2009-2010). Overall and sex-specific estimates of past-year drug use (cocaine and amphetamines, based on data availability) in the reference population were obtained from Ontario residents aged 16+ (n=39, 980) in the Canadian Community Health Survey (2009-2010), and standardized to the overall and gender-specific transgender age distributions...
March 31, 2017: Addictive Behaviors
https://www.readbyqxmd.com/read/28407106/rapid-decline-in-hiv-incidence-among-persons-who-inject-drugs-during-a-fast-track-combination-prevention-program-after-an-hiv-outbreak-in-athens
#4
Vana Sypsa, Mina Psichogiou, Dimitrios Paraskevis, Georgios Nikolopoulos, Chrissa Tsiara, Dimitra Paraskeva, Katerina Micha, Meni Malliori, Anastasia Pharris, Lucas Wiessing, Martin Donoghoe, Samuel Friedman, Don Des Jarlais, Georgios Daikos, Angelos Hatzakis
Background.: A "seek-test-treat" intervention (ARISTOTLE) was implemented in response to an outbreak of human immunodeficiency virus (HIV) infection among persons who inject drugs (PWID) in Athens. We assess trends in HIV incidence, prevalence, risk behaviors and access to prevention/treatment. Methods.: Methods included behavioral data collection, provision of injection equipment, HIV testing, linkage to opioid substitution treatment (OST) programs and HIV care during 5 rounds of respondent-driven sampling (2012-2013)...
April 12, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28386373/mechanism-of-progestin-resistance-in-endometrial-precancer-cancer-through-nrf2-survivin-pathway
#5
Rujia Fan, Yiying Wang, Yue Wang, Li Wei, Wenxin Zheng
Progestin is commonly used for young patients suffering from endometrial hyperplasia or cancer. However, there is approximately 30% failure rate with unclear mechanism. We investigated if Nrf2-survivin pathway contributes the progestin resistance (PR) in this setting. Current study detected Nrf2 and survivin protein expression in post progestin treated endometrial tissue samples by using immunohistochemistry. Transfection of Nrf2 and survivin into endometrial cancer cells in vitro was done to determine the roles of Nrf2 and survivin in progestin resistance...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28380126/factors-associated-with-violence-against-female-sex-workers-in-ten-brazilian-cities
#6
Francisca Sueli da Silva Lima, Edgar Merchán-Hamann, Margarita Urdaneta, Giseli Nogueira Damacena, Célia Landmann Szwarcwald
Few studies in Brazil have focused on violence against female sex workers, a theme that has attracted researchers' attention worldwide, especially due to possible associations with HIV. The current study aims to estimate the prevalence of violence against female sex workers according to type and perpetrator and to identify associated factors. A cross-sectional study was conducted with data on 2,523 female sex workers from ten Brazilian cities, and with the respondent-driven sampling (RDS). Prevalence of verbal violence was 59...
March 30, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/28379111/lifetime-doctor-diagnosed-mental-health-conditions-and-current-substance-use-among-gay-and-bisexual-men-living-in-vancouver-canada
#7
Nathan J Lachowsky, Joshun J S Dulai, Zishan Cui, Paul Sereda, Ashleigh Rich, Thomas L Patterson, Trevor T Corneil, Julio S G Montaner, Eric A Roth, Robert S Hogg, David M Moore
BACKGROUND: Studies have found that gay, bisexual, and other men who have sex with men (GBM) have higher rates of mental health conditions and substance use than heterosexual men, but are limited by issues of representativeness. OBJECTIVES: To determine the prevalence and correlates of mental health disorders among GBM in Metro Vancouver, Canada. METHODS: From 2012 to 2014, the Momentum Health Study recruited GBM (≥16 years) via respondent-driven sampling (RDS) to estimate population parameters...
May 12, 2017: Substance Use & Misuse
https://www.readbyqxmd.com/read/28370638/the-development-and-validation-of-static-and-adaptive-screeners-to-measure-the-severity-of-panic-disorder-social-anxiety-disorder-and-obsessive-compulsive-disorder
#8
Matthew Sunderland, Philip J Batterham, Alison L Calear, Natacha Carragher
A series of static and adaptive screeners for panic disorder, social anxiety disorder (SAD), and obsessive compulsive disorder (OCD) were developed and compared using data-driven methods to facilitate the measurement of each disorder in community samples. Data comprised 3175 respondents for the development sample and 3755 respondents for the validation sample, recruited independently using Facebook advertising. Item Response Theory (IRT) was utilized to develop static continuous screeners and to simulate computerized adaptive algorithms...
April 3, 2017: International Journal of Methods in Psychiatric Research
https://www.readbyqxmd.com/read/28338906/vertical-leaf-mass-per-area-gradient-of-mature-sugar-maple-reflects-both-height-driven-increases-in-vascular-tissue-and-light-driven-increases-in-palisade-layer-thickness
#9
Adam P Coble, Molly A Cavaleri
A key trait used in canopy and ecosystem function modeling, leaf mass per area (LMA), is influenced by changes in both leaf thickness and leaf density (LMA = Thickness × Density). In tall trees, LMA is understood to increase with height through two primary mechanisms: (i) increasing palisade layer thickness (and thus leaf thickness) in response to light and/or (ii) reduced cell expansion and intercellular air space in response to hydrostatic constraints, leading to increased leaf density. Our objective was to investigate within-canopy gradients in leaf anatomical traits in order to understand environmental factors that influence leaf morphology in a sugar maple (Acer saccharum Marshall) forest canopy...
March 3, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28328550/injection-drug-network-characteristics-are-important-markers-of-hiv-risk-behavior-and-lack-of-viral-suppression
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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