Sexual Networks of Racially Diverse Young MSM Differ in Racial Homophily But Not Concurrency.
Sexual Networks of Racially Diverse Young MSM Differ in Racial Homophily But Not Concurrency.
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DOI：
10.1097/qai.0000000000001620
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发表时间：
2018-04-15
期刊：
影响因子：
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通讯作者：
Mustanski B
中科院分区：
文献类型：
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作者：
Janulis P;Phillips G;Birkett M;Mustanski B
在男男性行为青年（YMSM）中，艾滋病毒感染存在着巨大的种族差异。然而，有证据表明，黑人YMSM不从事更高水平的风险行为。性网络可能有助于解释这一悖论。本研究利用自我中心指数随机图模型（ERGM）来检查并发性的变化（即，2个或多个同时伴侣）和同性恋（即，相同的种族/民族合作伙伴）在不同的YMSM样本的种族/民族群体。本研究的数据来自YMSM的纵向队列研究。参与者（n = 1，012）提供了他们在首次研究访视前6个月内的性接触数据。一系列以自我为中心的ERGM研究了如何提供跨种族/民族的同质性和并发性参数的单独估计，以提高这些模型的拟合度。使用这些参数模拟网络，以研究局部网络特征如何影响整个网络级别的风险。结果表明，同质性，但不是并发性，不同种族/民族。与白色和拉丁美洲同龄人相比，黑人参与者目睹了显着更高的种族/民族同质性。从这些模型中推断，黑人个体更有可能与艾滋病毒阳性个体相关，更接近艾滋病毒阳性个体。然而，白色个体更有可能在大的连接组件。这些研究结果表明，高种族同性恋结合现有的艾滋病毒的差异，帮助永久的艾滋病毒在黑人YMSM之间的传播。尽管如此，需要更多的工作来理解这些差异，因为单靠同质性不能无限期地维持它们。
Substantial racial disparities exist in HIV infection among young men who have sex with men (YMSM). However, evidence suggests Black YMSM do not engage in greater levels of risk behavior. Sexual networks may help explain this paradox. This study utilized egocentric exponential random graph models (ERGMs) to examine variation in concurrency (i.e., 2 or more simultaneous partners) and homophily (i.e., same race/ethnicity partners) across race/ethnicity groups in a diverse sample of YMSM. Data for this study comes from a longitudinal cohort study of YMSM. Participants (n = 1,012) provided data regarding their sexual contacts during the 6 months prior to their first study visit. A series of egocentric ERGMs examined how providing separate estimates for homophily and concurrency parameters across race/ethnicity improved the fit of these models. Networks were simulated using these parameters to examine how local network characteristics impact risk at the whole network level. Results indicated that homophily, but not concurrency, varied across race/ethnicity. Black participants witnessed significantly higher race/ethnicity homophily compared to White and Latino peers. Extrapolating from these models, Black individuals were more likely to be in a connected component with an HIV positive individual and closer to HIV positive individuals. However, White individuals were more likely to be in large connected components. These findings suggest that high racial homophily combined with existing disparities in HIV help perpetuate the spread of HIV among Black YMSM. Nonetheless, additional work is required to understand these disparities given that homophily alone cannot sustain them indefinitely.