STEM learning communities promote friendships but risk academic segmentation.

Universities are increasingly using learning communities (LCs) to promote the academic and social integration of entering students, especially within STEM majors. Examining the causal effect of LCs on student networks is necessary to understand the nature and scope of their impact. This study combines a regression discontinuity design with social network analysis to estimate the effect of a simple LC design on the size, strength, structure, and composition of friendship networks among students within the same biological sciences freshman cohort. Results of the quasi-experimental analysis indicate that LC participants acquired one additional friend in the major and increased their share of friends in the LC by 54 percentage-points. Exponential random-graph models that test mediation and alternative friendship mechanisms provide support for the theoretical argument that the LC promoted friendship development by structuring opportunities for interaction through block-registration into courses. Thus, this study shows that even simple LCs can shape the development of friendships through relatively low-cost administrative means. The increased access to resources and support facilitated by the LC is likely beneficial for participating students. However, there is a potential downside when eligibility for participation is determined using academic metrics that separate the student population into distinct classroom environments.

Belonging in diverse contexts: Sociability among same-ethnic and cross-ethnic peers.

Ethnically and racially diverse schools provide students opportunities to socially interact with both same- and cross-ethnic peers that can shape their sense of belonging within a school. This study investigates the extent to which same- or cross-ethnic friends influence feelings of school belonging in two large, diverse U.S. high schools (total N = 4,461; 9th-12th grade; 49.6% girls). Employing a longitudinal social network analytic approach, using stochastic actor-oriented modeling, this study found that students become more similar or stay similar to their same-ethnic friends, but not cross-ethnic friends, with no clear indication that students select friends based on similar levels of belonging. These novel findings highlight how feelings of school belonging are fostered through sociability in same-ethnic friend groups. Implications for interventions and other approaches to enhance school belonging are discussed. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Impedance Planimetry and the Changing Paradigm of Esophageal Dysphagia.

OBJECTIVES: Patients presenting with dysphagia can encounter a pathway to therapy and relief that is expensive and frustrating. High resolution impedance planimetry (HRIP) is a new mechanism for enhancing and possibly hastening that process. A balloon with integrated pressure sensors is utilized to measure luminal geometry and pressure by volume-controlled distention. Esophagogastric junction (EGJ) distensibility and body contractility are assessed at the time of other endoscopic procedures. Here we describe a single-center experience utilizing HRIP in the endoscopic evaluation of patients presenting with dysphagia. METHODS: A prospectively maintained registry of patients undergoing impedance planimetry assessments at an academic medical center was queried for demographics, procedural details, and patient-reported outcomes. RESULTS: Data was reviewed for 122 procedures performed by two providers. HRIP was performed in 63 (52%) patients for initial dysphagia assessment, 36 (30%) for follow-up assessment, and 20 (16%) as a procedural adjunct at the time of other planned procedures. HRIP contractile response was characterized as normal in 36%, absent in 32%, and diminished/disorganized in 14%. These results motivated clinical planning for surgical referral in 7 (5%) patients, 31 (26%) additional testing, and 82 (68%) continued medical management and follow-up. DISCUSSION: HRIP is an emerging endoscopic modality which can streamline diagnostic work-up and therapeutic planning for patients with symptomatic dysphagia. Using functional esophageal assessment at the time of other diagnostic and therapeutic procedures, HRIP may expedite care and lead to improved patient satisfaction and clinical outcomes.

Peer Network Processes in Adolescents' Health Lifestyles.

Combining theories of health lifestyles-interrelated health behaviors arising from group-based identities-with those of network and behavior change, we investigated network characteristics of health lifestyles and the role of influence and selection processes underlying these characteristics. We examined these questions in two high schools using longitudinal, complete friendship network data from the National Longitudinal Study of Adolescent to Adult Health. Latent class analyses characterized each school's predominant health lifestyles using several health behavior domains. School-specific stochastic actor-based models evaluated the bidirectional relationship between friendship networks and health lifestyles. Predominant lifestyles remained stable within schools over time, even as individuals transitioned between lifestyles. Friends displayed greater similarity in health lifestyles than nonfriend dyads. Similarities resulted primarily from teens' selection of friends with similar lifestyles but also from teens influencing their peers' lifestyles. This study demonstrates the salience of health lifestyles for adolescent development and friendship networks.

A Spy took a bite to get the diagnosis right: the benefit of SpyGlass technology in the diagnosis of autoimmune pancreatitis evading traditional diagnostic methods.

Autoimmune pancreatitis (AIP) is a rare form of chronic pancreatitis that is often overlooked and is usually characterised clinically by frequent presentations with obstructive jaundice. Serum IgG4 testing as a means to 'rule out' IgG4-related disease may not be as helpful as initially thought and may lead to a missed diagnosis if suspicion is low. We present a patient with a years long history of recurrent pancreatitis ultimately found to have AIP after undergoing evaluation with a relatively new technology, SpyGlass, which allows for direct cholangioscopy and enabled us to make the correct diagnosis.

Comparing targeting strategies for network-based adolescent drinking interventions: A simulation approach.

Public health researchers and social scientists highlight the promise of network-based strategies to inform and enhance interventions that curb risky adolescent health behaviors. However, we currently lack an understanding of how different variants of network-based interventions shape the distribution of targeted behaviors. The current project considers the effectiveness of five targeting strategies that are designed to have differential impacts on the health of program participants versus non-participants. Using simulations that are empirically-grounded in 28 observed school-based networks from the PROSPER study, we evaluate how these approaches shape long-term alcohol use for intervention participants and non-participants, separately, and consider whether contextual factors moderate their success. Findings suggest that enrolling well-connected adolescents results in the lowest drinking levels for non-participants, while strategies that target groups of friends excel at protecting participants from harmful influences. These trends become increasingly pronounced in contexts characterized by higher levels of peer influence.

Autonomous Learning of New Environments with a Robotic Team Employing Hyper-Spectral Remote Sensing, Comprehensive In-Situ Sensing and Machine Learning.

This paper describes and demonstrates an autonomous robotic team that can rapidly learn the characteristics of environments that it has never seen before. The flexible paradigm is easily scalable to multi-robot, multi-sensor autonomous teams, and it is relevant to satellite calibration/validation and the creation of new remote sensing data products. A case study is described for the rapid characterisation of the aquatic environment, over a period of just a few minutes we acquired thousands of training data points. This training data allowed for our machine learning algorithms to rapidly learn by example and provide wide area maps of the composition of the environment. Along side these larger autonomous robots two smaller robots that can be deployed by a single individual were also deployed (a walking robot and a robotic hover-board), observing significant small scale spatial variability.

Finding and Keeping Friends in College and Their Influence on Alcohol Use: A Network Analysis.

OBJECTIVE: We investigate how alcohol use and friendship co-evolve during students' transition to university. We discern effects of peer influence from friend selection based on alcohol use, whether such effects vary in strength across the school year, and whether alcohol has different effects on friendship formation versus friendship maintenance. METHOD: We gathered data on friendships, alcohol use, and binge drinking from 300 residence hall students (71% female) at a large, public U.S. university. Surveys were conducted at four time points during the 2015-2016 academic year. We used a stochastic actor-oriented model to test whether alcohol use was influenced by one's friends, while simultaneously testing for friend selection based on alcohol use and related network processes. RESULTS: Students were 7.0 times more likely to drink alcohol weekly if all versus none of their friends drank weekly and 6.8 times more likely to binge drink when all versus none of their friends engaged in binge drinking, after we controlled for friend selection. Alcohol use differentially affected friendship creation and maintenance in a complex manner: (a) weekly drinkers were more likely to form new friendships and dissolve existing friendships than nondrinkers and (b) similarity on drinking fostered new friendships but had no effect on friendship persistence. CONCLUSIONS: Friends influence one another's weekly drinking and binge drinking, whereas conversely, alcohol use contributes to both friendship formation and friendship instability.

Network Integration within a Prison-Based Therapeutic Community.

Prison-based therapeutic communities (TCs) are a widespread, effective way to help incarcerated individuals address substance abuse problems. The TC philosophy is grounded in an explicitly relational paradigm that entails building community and conditioning residents to increasingly take responsibility for leadership therein. Although TCs are based on cultivating a network that continuously integrates new residents, many common structural features can jeopardize TC goals and are hence discouraged (e.g., clustering, homophily). In light of this tension, analyzing the TC from a network perspective can offer new insights to its functioning, as well as to broader questions surrounding how networks integrate new members. In this study we examine a men's TC unit in a Pennsylvania prison over a 10-month span. Using data on residents' informal networks, we examine: (1) how well individuals integrate into the TC network across time, (2) what predicts how well residents integrate into the TC, and (3) how well the TC network structure adheres to theoretical ideals. Results suggest that individual integration is driven by a range of hypothesized factors and, with limited exceptions, the observed TC is able to foster a network structure and integrate residents consistent with TC principles. We discuss the implications of these results for evaluating TCs and for understanding the process of network integration.

First-year college students' weight change is influenced by their randomly assigned roommates' BMI.

BACKGROUND: There is ongoing debate about whether friends' greater similarity in Body Mass Index (BMI) than non-friends is due to friend selection, shared environments, or peer influence. METHODS: First-year college students (n = 104) from a southwestern U.S. university were randomly assigned roommates during the university's housing process, effectively removing friend selection effects. Participant BMI was measured up to four times (T1-T4) across 2015-2016. The influence of roommate baseline BMI (T1) on change in participant BMI over time (T2-T4) was analyzed using a linear mixed effects model adjusted for individual socio-demographics, linear time trends, baseline BMI, and physical clustering of students. A sensitivity analysis examining floormates was also conducted. RESULTS: Consistent with roommate influence, participants randomized to roommates with a higher BMI gained more weight between times T2 and T4 (ß = 0.06; 95% CI = 0.02, 0.10). No shared environment effects (shared campus or floor) were found. CONCLUSIONS: Randomly assigned roommates influenced each other's weight trajectories. This clarifies that BMI convergence can occur outside of friend selection or shared environments mechanisms.

Crafting Mosaics: Person-Centered Religious Influence and Selection in Adolescent Friendships.

This research addresses the intersection of two key domains of adolescents' lives: religion and peer networks. Religion scholars argue that religion is multi-faceted and better understood by focusing on combinations of indicators (i.e. mosaics), versus a variable-centered approach. We adopt this framework and investigate the interplay between religion and peer networks, both in how religious mosaics are shaped by friends and how religious profiles affect friend selection dynamics. With data from two schools in the National Longitudinal Study of Adolescent Health, we estimate religious mosaics using latent class analysis (LCA) to identify profiles consisting of combinations of commonly available survey-based measures of religious attitudes, behaviors, and identities. Finding evidence of theoretically-expected profiles, we then use stochastic actor based models (SABMs) to investigate network dynamics for these LCA-based religious profiles. We demonstrate how the profile data can be integrated within the SABM framework to evaluate processes of friend selection and influence. Results show evidence of adolescents influencing one another's religious mosaics, but not selecting friends on that basis.

Development of a Training Program for Law Enforcement K9 Handlers to Administer Naloxone.

As the opioid epidemic continues across the United States, law enforcement K9s (LEK9s) are at increased risk of accidental exposure and overdose. This study evaluated a novel training program teaching handlers to administer naloxone to their LEK9 in the event of an overdose. Seventy-five LEK9 handlers from a governmental agency attended a naloxone training session. A presurvey given to the handlers evaluated their knowledge of opioid overdose in LEK9s and their confidence administering naloxone. Officers were educated via a PowerPoint presentation about naloxone and how to administer it to their LEK9. A postsurvey evaluated changes in their knowledge and confidence as a result of the presentation. Sixty-two presurveys and 47 postsurveys were completed. Nearly all handlers had never given their LEK9 an intramuscular or intranasal injection. Most handlers were not comfortable monitoring their LEK9's vital signs for an opioid overdose. After the training, handlers demonstrated a mild increase in comfort level administering intramuscular and intranasal naloxone (15 and 14% increase, respectively). Comfort level monitoring vital signs and symptoms of an opioid overdose increased 38 and 32%, respectively. Handlers may not be fully prepared to assess and treat their LEK9 and may benefit from a targeted training program teaching them to administer naloxone.

Loneliness and cortisol are associated with social network regulation.

This study examines how loneliness and the body's stress response system interact to regulate social connections. We suggest that the drive to reconnect signaled by loneliness can be accompanied physiologically by the production of cortisol, which can offer supportive coping resources. Thus, we investigated how loneliness, cortisol levels, and their interaction predicted changes in network connections in a social organization. Participants (n = 193; 53% female) provided friendship network data at two times. At time 1, participants reported on loneliness and donated saliva (later assayed for cortisol). Results revealed that concurrently, lonely individuals reported fewer friendships, whereas over time, they named more friends. These results support the hypothesis that loneliness is a signal to develop connections. We also explored whom lonely individuals befriended over time. Results showed that cortisol significantly moderated the preference for friends with a similar level of loneliness. Specifically, lonely individuals with higher cortisol befriended those who were less lonely over those who were lonelier. Thus, cortisol levels may serve an adaptive function in mobilizing resources to develop connections that fulfill social belongingness needs. Results supported the theorized signaling function of loneliness and revealed that loneliness and the stress response system interact to shape social connections.

New on the Block: Analyzing Network Selection Trajectories in a Prison Treatment Program.

Personal network change is largely driven by transitions between the groups and organizations where people spend their day-to-day lives. But, how do entrants choose which relationships to pursue among the numerous possibilities a new environment offers? We expect newcomers will use the same mechanisms as longer-tenured members, although this will take time as they acclimate and form initial relationships that support future ties. Thus, our goal is to understand how the network selection processes used by new organizational members shift in importance as time in the organization grows. We focus on network selection via homophily, propinquity, formal relations, and endogenous network processes. For each mechanism, we distinguish between change in the strength of the mechanism and opportunities to enact the mechanism. We evaluate expected changes using network data from a prison-based therapeutic community (TC). This setting is ideal because the structured nature of TC entry and exit generates regular membership turnover and removes confounds present in studies of more familiar contexts (e.g., schools). Results show that the relative importance of network selection mechanisms varies over tenure, with homophily dominating early on and endogenous network processes catching up later. We discuss implications of these findings for new member socialization and broader patterns of inequality.

Similarity in meal plan use among first-year roommates.

OBJECTIVE: To examine if first-year roommates made similar meal plan decisions. METHODS: Residence information for 1186 first-year students (N = 593 roommate pairs) and 559 floormates was obtained for the 2015-2016 academic year. Linear generalized estimating equations (GEEs) were used to examine if the number of meals students used over the semester was higher if their roommate used their meal plan more frequently. A logistic GEE examined joint meal plan usage between students and roommates for each month of the semester. To determine if residence, rather than roommate, explained the results, a simulation was conducted by randomly assigning the floormates to a same-sex roommate. RESULTS: The number of meals students used in spring was higher if the students' roommate had used more meals in spring, even after controlling for the number of meals students used in fall (Female: ß = 0.07, 99% CI = 0.00, 0.13; Male: ß = 0.10, 99% CI = 0.02, 0.18). Students were more likely to use a meal with their roommate if they were on the same meal plan (Female: OR = 1.61, 99% CI = 1.27, 2.04; Male: OR = 1.57, 99% CI = 1.09, 2.25), and less likely after the first month of being roommates (Female: OR = 0.57-0.25; Male: OR = 0.50-0.22; p < 0.001). The simulation analysis indicated these findings were not due to shared residence. DISCUSSION: Students' meal plan choices were associated with their roommates' meal plan choices. Roommates' joint meal plan usage was highest at the start of the year. Strategic roommate pairings may result in students using their meal plan more. Further research should determine the extent of roommate influence on students' diet.

Client perceptions of the value of veterinary anesthesiologist involvement with anesthesia and pain management, benefits of a preanesthetic consultation, and quality of care for dogs undergoing elective orthopedic surgery.

OBJECTIVE: To compare perceptions related to veterinary anesthesiologist involvement with anesthesia and pain management, benefits of a preanesthetic consultation (PAC) with an anesthesiologist, and quality of patient care between clients who did and did not participate in a PAC prior to their dogs' elective orthopedic surgery. SAMPLE: 80 dog owners. PROCEDURES: Owners of dogs undergoing elective stifle joint surgery participated in the study. Participants were randomly assigned to PAC and control groups (n = 40 participants/group). The PAC group participated in a PAC with an anesthesiologist and completed a written survey (12 items with Likert-type response options). The control group completed a similar survey (identical except for 2 statements related to the PAC experience) without participating in a PAC. Results were compared between groups by statistical methods. RESULTS: The proportion of clients in the PAC group who strongly agreed with the statements that a PAC was beneficial, their questions about the pet's anesthesia and pain management plan were answered, they knew who would perform anesthesia and what safeguards were in place, veterinary specialty hospitals should have an anesthesiologist on staff, they were willing to pay more to have an anesthesiologist supervise the anesthesia and pain management, and a PAC with an anesthesiologist should be standard of care in veterinary medicine was greater than that for control group clients. Responses to quality-of-care items did not differ between groups. CONCLUSIONS AND CLINICAL RELEVANCE: Participating in a PAC was associated with more positive perceptions of anesthesiologists and knowledge about the anesthesia plan. Further research with a validated survey instrument is needed to confirm these findings.

Evaluating peer-influence processes in a prison-based therapeutic community: a dynamic network approach.

BACKGROUND: The Therapeutic Community (TC) is a common treatment modality for incarcerated individuals with substance use disorders. TCs rely on peer group processes to promote lasting behavioral and identity change, yet prior research has not adequately tested the peer influence mechanisms underlying the theoretical model. This study applied dynamic network analysis to estimate peer influence processes central to TC philosophy. METHODS: A stochastic actor-oriented model (SAOM) was applied to ten months of social network data collected from prisoner surveys within a TC unit (N = 62) in a medium-security Pennsylvania prison. Respondents (N = 177, 84% of unit) completed at least one prison survey and provided network and community role model nominations. RESULTS: Although residents' levels of treatment engagement were significantly correlated with their nominated peers, estimates of peer influence for treatment engagement were non-significant in longitudinal network models. Nor were estimates of peer influence significantly greater for peers perceived as community role models. Rather, inmates connected with peers who were of similar treatment engagement as themselves (i.e., a peer selection process), and the latter primarily resulted from racial homophily in the TC social network. CONCLUSIONS: Inconsistent with the desired treatment model, treatment engagement diffusion was not evident in the sampled TC. Results suggested that highly-engaged residents clustered together at the center of the TC's social structure but had little impact on less-engaged and peripheral inmates. The relatively short (i.e., four-month) program length and moderate-to-low treatment fidelity likely contributed to the lack of peer influence processes.

Evaluating Potential Behavioral Mediators for Increasing Similarity in Friends' Body Size among College Students.

College students and their friends become more similar in weight status over time. However, it is unclear which mediators explain this relationship. Using validated survey measures of diet, physical activity, alcohol intake, sleep behaviors, mental health, and food security status, we take a comprehensive look at possible factors associated with excess weight gain that may explain friends' convergence on body mass index (BMI), waist circumference, waist to hip ratio, and waist to height ratio over time. We use linear mixed models applied to a longitudinal dataset of first-year college students to examine whether these variables satisfy two criteria for potential candidate mediators of friends' influence on anthropometrics-cross-sectional similarity among friends (n = 509) and longitudinal associations with increasing anthropometrics (n = 428). While friends were similar on some survey measures (such as dining hall use, home cooked meal consumption, fruit intake, alcohol intake, hours of sleep, and stress). Only dining hall use and stress emerged as potential explanations for why friends' BMI and anthropometric change may be similar. Given that only a few variables satisfied the two criteria as potential mediators, future research may need to consider alternative measurement approaches, including real-time assessments, objective measurements, and alternative factors causing the convergence of friends' and college students' body size over time.