Time-space Sampling Research Articles

Impact of Covid-19 pandemic on the workload and home office in some European countries

The spread of a new and unknown viral infectious disease named the Covid-19 pandemic paralysed world without any preparation time. It has significantly changed approaches to organizational management as well as HR policy. Governments have taken immediate measures to address the challenges caused by the COVID-19 pandemic, including protecting jobs, providing financial support to businesses and households experiencing a sharp drop in income. The present study focuses on a subfield of a previous larger research, on the change in workload due to the COVID-19 pandemic and the increase in the frequency of remote work, as well as their consequences. The increase in telecommuting is one of the innovations that can clearly be attributed to the impact of the pandemic. It has become an accepted form of work in many sectors where even the professionals did not think of using it before. The research has been conducted based on the questionnaire consisted of groups of questions related to the demographic characteristics (age, gender, place of residence, position), development of the workload, and the more complicated working conditions caused by Covid19 pandemic. The respondents from Hungary, Montenegro, Spain and the United Kingdom were selected using a respondent-driven time space sampling procedure. The method of sampling and the size of the target group can be considered as limitations of our research – the statistical conditions for evaluation are nevertheless met, given the for the number of elements and normality of the sample as a whole and its individual groups. As results, authors found that the same epidemic in each country led to different workload increases and affected subordinates and non-subordinates, and women and men to different degrees. Among the effects of the crises caused by the pandemic, the increase in workload is the most significant. That must be taken into consideration in the HRM policy. The most important finding is that the increasing frequency of remote work to a certain extend can be considered as innovation. The nature of the research conducted on basis of four European countries can contribute to the future development of scientific study related the solution of similar problems in HR management and labour organization.

A Key Comprehensive System for Biobehavioral Surveillance of Populations Disproportionately Affected by HIV (National HIV Behavioral Surveillance): Cross-sectional Survey Study.

The National HIV Behavioral Surveillance (NHBS) is a comprehensive system for biobehavioral surveillance conducted since 2003 in 3 populations disproportionately affected by HIV: gay, bisexual, and other men who have sex with men (MSM); people who inject drugs; and heterosexually active persons at increased risk for HIV infection (HET). This ongoing and systematic collection and analysis of data is needed to identify baseline prevalence of behavioral risk factors and prevention service use, as well as to measure progress toward meeting HIV prevention goals among key populations disproportionately affected by HIV. This manuscript provides an overview of NHBS from 2003 to 2019. NHBS is conducted in rotating, annual cycles; these 3 annual cycles are considered a round. Venue-based, time-space sampling is used for the MSM population. Respondent-driven sampling is used for people who inject drugs and HET populations. A standardized, anonymous questionnaire collects information on HIV-related behavioral risk factors, HIV testing, and use of prevention services. In each cycle, approximately 500 eligible persons from each participating area are interviewed and offered anonymous HIV testing. From 2003 to 2019, 168,600 persons were interviewed and 143,570 agreed to HIV testing across 17 to 25 cities in the United States. In the fifth round (2017 to 2019), over 10,000 (10,760-12,284) persons were interviewed each of the 3 population cycles in 23 cities. Of those, most (92%-99%) agreed to HIV testing. Several cities also conducted sexually transmitted infection or hepatitis C testing. NHBS is critical for monitoring the impact of the Ending the HIV Epidemic in the United States initiative. Data collected from NHBS are key to describe trends in key populations and tailor new prevention activities to ensure high prevention impact. NHBS data provide valuable information for monitoring and evaluating national HIV prevention goals and guiding national and local HIV prevention efforts. Furthermore, NHBS data can be used by public health officials and researchers to identify HIV prevention needs, allocate prevention resources, and develop and improve prevention programs directed to the populations of interest and their communities.

Initiation into the street, challenges, means of survival and perceived strategies to prevent plights among street children in Addis Ababa, Ethiopia 2019: A phenomenological study design.

BackgroundThe life and health of street children are becoming a global concern. Push and pull factors i.e. poverty, family death, economic decline, child abuse, financial independence, and peer influence draw children into the street. The street lives by itself pushes them into sex work, and lack of shelter magnificent abuses, where both sexes have the same sleeping quarters.Materials and MethodsA phenomenological study design was employed from January to March 2019 in Addis Ababa, Ethiopia. Time-Space Sampling (TSS) was used to recruit participants into the study. Focus Group Discussion (FGD) and individual in-depth interview were used to collect data. Data analyzed by using framework analysis software.ResultsAbout 103 participants took part in the study. Finding shows street children are encountering widespread challenges like social network fragmentation, child trafficking, harassments, and shortage of basic needs. Furthermore, poor design of comprehensive, contextualized strategies and less political value worsening the problems. They are considered as a felon, outlaws, and having a mentality of committing a crime by both law-keeping bodies and society. This situation resulted in fewer acceptances of street children by the community, and less legal protection by law that made them more at risk for denial of social protection. Street children positively perceived strategies like Income Generating Activities (IGAs), shelter, community support, child protection, and access to education, health services, life coaching, and less extent re-integration strategies to address their problems.ConclusionThe study shows street children are defenseless to harassments and denial of social protection services. Poorly designed policies, strategies targeting them, less political values, and traditional response by government has been subjugated, which made them prone to health and social problems. Therefore, finding might be beneficial to health data scientists, and policymakers; to design and implement policies, and strategic plans in addressing, and preventing their plights.

Risky Party and Nightclub Attendance during the COVID-19 Nightlife Shutdown in New York City.

From March 2020 through May 2021, nightlife venues were shut down and large gatherings were deemed illegal in New York City (NYC) due to COVID-19. This study sought to determine the extent of risky party attendance during the COVID-19 shutdown among people who attend electronic dance music parties in NYC. During the first four months that venues were permitted to reopen (June through September 2021), time–space sampling was used to survey adults (n = 278) about their party attendance during the first year of the shutdown (March 2020–March 2021). We examined prevalence and correlates of attendance and mask-wearing at such parties. A total of 43.9% attended private parties with more than 10 people, 27.3% attended nightclubs, and 20.5% attended other parties such as raves. Among those who attended any, 32.3% never wore a mask and 19.3% reported attending parties in which no one wore a mask. Past-year ecstasy use was associated with increased risk for attending private (aPR = 1.51, 95% CI: 1.00–2.28) or other parties (aPR = 2.75, 95% CI: 1.48–5.13), and use of 2C series drugs was associated with increased risk for attending nightclubs (aPR = 2.67, 95% CI: 1.24–5.77) or other parties (aPR = 2.50, 95% CI: 1.06–5.87). Attending >10 parties was associated with increased risk for never wearing a mask (aPR = 2.74, 95% CI: 1.11–6.75) and for no other attendees wearing masks (aPR = 4.22, 95% CI: 1.26–14.07). Illegal dance parties continued in NYC during the COVID-19 shutdown. Prevention and harm reduction efforts to mitigate risk of COVID-19 transmission during such shutdowns are sorely needed.

Physical and Sexual Violence and Sexual Behaviors Among Men Who Have Sex with Men in 22 U.S. Cities-National HIV Behavioral Surveillance, 2017.

National prevalence of physical and sexual violence and its relationship to sexual behaviors are unknown among men who have sex with men (MSM). We estimated 12-month prevalence of physical and sexual violence and assessed relationships between violence and sexual behaviors among MSM. Data were obtained from National HIV Behavioral Surveillance 2017 that used time-space sampling methods to recruit and interview MSM in 22 U.S. cities. Weighted percentages with 95% confidence intervals (CI) were reported. Adjusted prevalence ratios (aPR) and 95% CIs were calculated using logistic regression with predicted marginal means. Overall, 10.2% (95% CI: 9.3%-11.2%) of MSM experienced physical violence only, 3.2% (95% CI: 2.7%-3.7%) experienced sexual violence only, and 2.3% (95% CI: 1.9%-2.7%) experienced both types of violence, in the past 12 months. Compared to MSM who did not experience violence, those who did reported higher percentages of unemployment, poverty, homelessness, same-sex discrimination, non-injection drug use, and binge drinking. Violence was not independently associated with condomless anal sex among MSM. MSM who experienced both types of violence were more likely than those who did not experience violence to have had four or more male sex partners (aPR=1.18, 95% CI: 1.02-1.37). MSM who experienced both types of violence (aPR=2.49, 95% CI: 1.52-4.09), sexual violence (aPR=2.27, 95% CI: 1.47-3.52), or physical violence (aPR=1.76, 95% CI: 1.27-2.44) were more likely than those who did not experience violence to have had exchange sex. Recent physical violence and sexual violence are common among MSM. Findings highlight the importance of violence screening and suggest the need for tailored interventions that improve the safety and economic security of MSM who experience violence, including those who exchange sex.

Surveying through gatekeepers in social research: methodological problems and suggestions

ABSTRACT Recruiting participants through gatekeepers has been widely discussed in qualitative research. However, when a sampling frame is not available, surveying through gatekeepers can also be important for quantitative studies. We used three sampling methods to survey guardians of University students: (a) a gatekeeper variant of the time-space sampling, (b) a direct postal survey to a random sample of guardians’ addresses, and (c) a phone survey of the general population. The gatekeeper survey was the most efficient, but yielded a skewed sample. Albeit skewed, the gatekeeper sample yielded the same responses as the random sample, on five theoretically important scales (N = 29 questions). In-depth personal interviews and online semi-structured questionnaires with guardians and students revealed a two-way gatekeeping mechanism within families, regulating guardians’ participation in the study. We discuss the indispensable contribution of qualitative data in our study and provide methodological suggestions for practitioners.

Drug checking at dance festivals: A review with recommendations to increase generalizability of findings.

Dance festival attendees are at high risk for consuming adulterated drugs. In recent years, drug checking studies have been conducted at various dance festivals to provide valuable harm reduction information to attendees regarding drug content. We conducted a review of the literature to determine the generalizability of findings to the target population of interest-festival attendees at risk for using adulterated drugs. Six published studies involving drug checking at festivals were reviewed. All relied on self-selected samples and male attendees were overrepresented based on previous research. Test methods, drugs tested, definitions of adulteration, and prevalence of adulteration varied across studies. Prevalence of detection of adulterants ranged from 11% to 55%. While the drug checking services described appear to have been beneficial for participants, results have limited generalizability to the target population. We recommend that researchers expand beyond the self-selection model in future studies and utilize recruitment methods that involve random sampling techniques such as systematic random sampling, stratified random sampling, or time-space sampling within festivals. We also recommend that individuals approached are surveyed for demographic characteristics, planned drug use at the festival, and willingness to test their drugs. These methods would help determine how representative the sample is compared to the target population and allow for more generalizable estimates. In conclusion, as these valuable harm reduction services expand, it may be possible to reach a wider portion of the population at risk and to obtain more generalizable estimates of engagement, adulteration, and reactions to learning one possesses adulterated drugs. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Utilisation of sexual and reproductive health services among street children and young adults in Kampala, Uganda: does migration matter?

BackgroundWhile the nexus of migration and health outcomes is well acknowledged, the effect of rural–urban migration on the use of sexual and reproductive health (SRH) services has received less attention. We assessed the effect of rural–urban migration on the use of SRH services, while controlling for confounding, and whether there is a difference in the use of SRH services among migrant and non-migrant street children and young adults.MethodsData were collected from 513 street children and young adults aged 12–24 years, using venue-based time-space sampling (VBTS). We performed multivariate logistic regression analysis using Stata 16.0 to identify factors associated with SRH services use, with rural–urban migration status as the main predictor. Participants were further classified as new migrants (≤ 2 years of stay in city), established migrants (> 2 years of stay in city) or non-migrants (lifelong native street children) with no rural–urban migration history.ResultsOverall, 18.13% of the street children and young adults had used contraception/family planning, 58.67% had tested for human immunodeficiency virus (HIV) and knew their status and 34.70% had been screened for sexually transmitted infections (STIs). Non-migrants were 2.70 times more likely to use SRH services (HIV testing, STI screening and family planning) compared to the migrants (aOR = 2.70, 95% CI 1.23–5.97). Other factors associated with SRH services use among street children and young adults include age (aOR = 4.70, 95% CI 2.87–7.68), schooling status (aOR = 0.33, 95% CI 0.15–0.76), knowledge of place of care (aOR = 2.71, 95% CI 1.64–4.46) and access to SRH information (aOR = 3.23, 95% CI 2.00–5.24).ConclusionsSRH services utilisation among migrant street children and young adults is low compared to their non-migrant counterparts and is independently associated with migration status, age, schooling status, knowledge of place of care and access to SRH information. Our findings call for the need to design and implement multi-dimensional interventions to increase the use of SRH services among street children and young adults, while taking into consideration their migration patterns.

Development and validity evidence of the Two-Dimensional Sexual Sensation Seeking Scale

Sexually transmitted infections (STIs), mainly HIV/AIDS, are acquired through risky sexual behaviors that have been associated with sexual sensation seeking. The purpose of this work is development a new scale for the assessment of sexual sensations seeking, with evidence of validity based on internal structure and relationship to other measures, for use in young people and adults in a Latin American context. An instrumental study was performed, with time-space sampling of students from the two Chilean cities with the highest rates of HIV. Final scale has 9 items to evaluate two dimensions: (1) sexual emotions seeking; and (2) tendency to sexual boredom. The identified structure provides good levels of reliability and presents validity evidence, based on the internal structure of the test, using CFA and ESEM. Two-dimensional sexual sensation seeking scale evidence proper psychometric properties to evaluate the seeking for sexual sensations in equivalents samples.

Diffusion of Ecstasy in the Electronic Dance Music Scene

Background Ecstasy (MDMA, Molly) is among the most prevalent drugs used by people who attend electronic dance music (EDM) events; however, little recent research has examined diffusion of ecstasy in this high-risk population. Methods: 1,020 EDM event-attending adults (aged 18–40) were surveyed in NYC in 2018 using time-spacing sampling. Participants were asked about past-year ecstasy use, and those reporting use were asked where they initiated use and whether their first use was planned. They were also asked whether they have ever given someone their first dose and whether they were likely to use in the future. Prevalence and correlates of these outcomes were estimated among those reporting past-year use. Results: An estimated 31.0% of participants used ecstasy in the past year. Of these, 42.9% used ecstasy for the first time in an unplanned manner and initiation most commonly occurred at EDM festivals (33.4%), followed by nightclubs (24.3%). An estimated 39.4% reported having given someone their first dose of ecstasy and 60.2% reported being likely to use again. Hispanic and Asian participants were at higher risk for their first dose being unplanned, and those who used LSD in the past year were at higher risk for giving someone their first dose (aPR = 1.78, 95% CI = 1.20-2.65). Older participants (aPR = 1.03, 95% CI = 1.01-1.06), females (aPR = 1.46, 95% CI = 1.13–1.89), and those who used LSD in the past year (aPR = 1.42, 95% CI = 1.14-1.76) were more likely to report being likely to use again in the future. Conclusions: Results provide insight regarding diffusion and initiation of ecstasy in the EDM scene. Findings can inform prevention and harm reduction efforts.

Underreporting of drug use among electronic dance music party attendees

Background and Objectives Electronic dance music (EDM) party attendees are at high risk for drug use. However, little is known regarding the extent of underreporting of drug use in this population, in part, because use of synthetic drugs is often associated with unknown exposure to adulterant drugs. We estimated the extent of underreported drug use in this population by comparing self-reported use to hair toxicology results. Methods Time-space sampling was used to survey adults entering EDM events at nightclubs and dance festivals in New York City from January through August of 2019. Seven hundred ninety-four adults were surveyed and 141 provided analyzable hair samples. We queried past-year use of >90 drugs and tested hair samples using ultra-high performance liquid chromatography–tandem mass spectrometry. We compared hair test results to past-year self-reported use and adjusted prevalence estimates by defining use as reporting use or testing positive. Correlates of discordant reporting, defined as testing positive after not reporting use, were estimated. Results Prevalence of drug use increased when considering positive hair tests in estimates, with 43.8% of participants testing positive for at least one drug after not reporting use. For example, based on self-report, cocaine use prevalence was 51.1%, and increased by a factor of 1.6 to a prevalence of 80.0% when adding hair test results to self-report. Younger adults (ages 18–25), black and other/mixed race participants, those reporting “other” sexuality, and those with a college degree were at significantly higher risk for testing positive for drugs not reportedly used. Those who self-reported using more types of drugs were less likely to test positive after not reporting use (adjusted prevalence ratio = 0.53, 95% confidence interval = 0.41-0.68). Conclusions We detected underreporting of drug use, particularly cocaine and ketamine. More research is needed to determine whether this is driven by intentional underreporting or unknown exposure through adulterants.

Nightlife scene involvement and patterns of prescription drug misuse.

Participation in nightlife influences a range of health behaviours. Participants in various nightlife scenes have increasingly adopted prescription drug misuse into their substance use repertoires. With 404 young adults recruited via time-space sampling in New York, we examine the relationship of nightlife participation-measured by number of scenes and the number of nights out in nightlife scenes-to prescription drug misuse during the past 3 months. Outcomes included frequency of misuse, escalation to non-oral consumption, polydrug use, social problems and symptoms of dependence. Negative binomial regressions indicate nightlife participation is associated with increased frequency of misuse measured by number of scenes (incidence rate ratio = 1.114, P < 0.05) and number of nights out (incidence rate ratio = 1.009, P < 0.001). Logistic regression models show nightlife participation is associated with increased odds of non-oral use (adjusted odds ratio; AOR = 1.334, P < 0.01) and polydrug use (AOR = 1.776, P < 0.001) measured by number of scenes, and non-oral use (AOR = 1.021, P < 0.001) and polydrug use (AOR = 1.023, P < 0.001) as measured by number of nights out. Nightlife participation is not associated with prescription drug problems or symptoms of dependence. Frequency of participation is associated with peer norms favourable to prescription drugs (B = 0.003, P < 0.01). Nightlife participation has implications for prescription drug misuse. While shaping how often and in what manner young people consume prescription drugs, nightlife participation is not associated with harms experienced. Given the significance of the prescription drug trend in many world regions, these results suggest that increasing participation in nightlife shapes patterns of drug use, but in ways that do not lead to reported problems.

Increasing Willingness to Use Synthetic Drugs if Offered among Electronic Dance Music Party Attendees, 2017–2019

ABSTRACT Intention and willingness to use drugs are proximal predictors of drug use; however, willingness to use requires more research to inform prevention efforts. This study examines willingness to use drugs among electronic dance music (EDM) party attendees, a population at high risk for drug use. Data were examined from a repeated cross-sectional study of 2,426 adult EDM party attendees surveyed entering nightclubs and festivals in New York City from 2017 to 2019 using time-space sampling. Trends and correlates of reporting whether participants would use ten different synthetic drugs if offered by a friend in the next thirty days were examined. Ecstasy (31.9%), powder cocaine (25.5%), LSD (20.0%), and opioids (16.4%) were most likely to be used if offered. Willingness to use powder cocaine, LSD, ketamine, amphetamine, tryptamines, and 2C series drugs significantly increased from 2017 to 2019, particularly powder cocaine (increasing from 19.1% to 34.2%, p <.001). Any or more recent use of each drug was associated with increases in willingness to use. Past drug use is a consistent predictor of willingness to use if offered, and willingness to use is increasing in this population. Findings can inform prevention efforts by allowing better targeting of those at risk for use.

Trends in drug use among electronic dance music party attendees in New York City, 2016–2019

ObjectiveElectronic dance music (EDM) party attendees are a high-risk population for drug use and associated adverse effects. We examined trends in past-year drug use within this population to better inform prevention and harm reduction efforts. MethodsEach summer from 2016 through 2019, we used time-space sampling to survey a cross-section of adults entering EDM parties at randomly selected nightclubs and at dance festivals in New York City. Ns ranged from 504 (2019) to 1,087 (2016). We estimated log-linear trends in past-year use of 16 different synthetic drugs or drug classes. ResultsBetween 2016 and 2019, estimated past-year prevalence of use of ketamine increased from 5.9% to 15.3% (a 157.6% relative increase; P = .007), LSD use increased from 9.9% to 16.6% (a 67.7% relative increase, P < .001), powder cocaine use increased from 17.3% to 35.2% (a 103.5% relative increase, P < .001), and GHB use increased from 1.0% to 4.2% (a 311.8% relative increase; P = .002). Past-year use of >3 drugs increased from 12.7% to 20.5% (a 61.4% relative increase; P = .013); however, estimated past-year use of unknown powders decreased from 2.0% to 1.1% (a relative 44.7% decrease; P = .038) and ecstasy/MDMA/Molly use was stable across years (at 25.0 to 28.5 %; P = .687). ConclusionsReports of powder cocaine, LSD, ketamine, and GHB are becoming more prevalent among EDM party attendees. Prevention and harm reduction efforts are needed to address increasing use. Research is also needed to examine whether increasing media coverage of medical use of ketamine and other psychedelics affects prevalence of recreational use.

Non-Consensual Sexual Contact at Electronic Dance Music Parties.

Non-consensual sexual contact in bars is common, but few studies have focused on the extent of this problem at electronic dance music (EDM) parties, which are growing in popularity. We aimed to estimate prevalence and correlates of non-consensual sexual contact among individuals who attend EDM parties in New York City (NYC). Adults (ages 18-40 years) entering EDM parties in NYC were surveyed in 2018 using time-space sampling. Participants (n = 1005) were asked whether they had experienced unwanted or uninvited sexual contact including unwanted groping, kissing, or touching at an EDM party. We estimate that 15.2% of EDM party attendees in NYC have experienced non-consensual sexual contact at such parties. The majority (62.5%) of those reported that it occurred 1-2 times and 49.1% were usually or always drunk or high during the encounter(s). Almost all women experiencing non-consensual contact (99.5%) were all or mostly touched by men; 38.6% of men were all or mostly touched by other men. Women were at more than twice the odds of reporting non-consensual sexual contact than men (aOR = 2.38, p < .05) with 21.8% of women reporting experiencing non-consensual sexual contact compared to 11.0% of men. Among women, those ages 18-24 were at over twice the odds (aOR = 2.75, p < .05) of experiencing non-consensual sexual contact than those ages 25-40. EDM party environments can increase susceptibility to non-consensual sexual contact. Prevention needs to be geared toward those at risk, and education is needed for those likely to commit non-consensual sexual contact.

Underreporting of drug use on a survey of electronic dance music party attendees

Objectives: Skip-logic is commonly used on electronic surveys in which programs provide follow-up questions to affirmative responses and skip to the next topic in response to non-affirmative responses. While skip-logic helps produce data without contradictory responses, erroneous non-affirmative reports can lead to loss of accurate information. We examined the extent to which type-in drug use responses contradict unreported use in a survey of a high-risk population—electronic dance music (EDM) party attendees.Design: We surveyed 1029 EDM party-attending adults (ages 18–40) using time-spacing sampling in 2018. We examined the extent to which reporting of recent drug use via type-in responses occurred after past-year use of the same drugs were unreported earlier on the same survey. Changes in prevalence of use and predictors of providing discordant responses were examined.Results: 3.6% of participants typed in names of drugs they had used that they did not report using earlier on the survey. Changes in prevalence were not significant when correcting contradictory responses, but prevalence of past-year cocaine use increased from 23.3% to 24.3%. Those with a college degree were at lower odds for providing a discordant response (aOR = 0.13, p = .019). Females (aOR = 2.82, p = .022), those earning ≥$1000 per week (aOR = 11.03, p = .011), and those identifying as gay/lesbian (aOR = 5.20, p = .032) or bisexual or other sexuality (aOR = 15.12, p < .001) were at higher odds of providing a discordant response.Conclusions: Electronic surveys that query drug use can benefit from follow-up (e.g. open-ended) questions not dependent on previous responses, as they may elicit affirmative responses underreported earlier in the survey.

Use of "Lean" Among Electronic Dance Music Party Attendees.

Lean (a.k.a.: Sizzurp, Purple Drank) is a recreational beverage that commonly contains codeine cough syrup. Despite its popularization in the hip-hop music scene, few epidemiologic studies have examined use. This study examined prevalence and correlates of use among a population at high-risk for drug use-electronic dance music (EDM) party attendees. A total of 1029 EDM party attendees (ages 18-40) were surveyed in New York City in 2018 using time-space sampling. Prevalence and correlates of use of Lean were estimated. An estimated 15.5% of attendees have ever used Lean, and 3.4% of attendees have used in the past year. Only an estimated 0.2% have used in the past month, but 14.2% would use in the next month if offered by a friend. Three-quarters (75.4%) of users believed their Lean ever contained codeine and 32.4% believed it always or usually contained codeine. Past-year use was strongly associated with past-year nonmedical prescription opioid use (adjusted odds ratio = 10.77, P = 0.003), but not past-year use of other illegal drugs. Attendees who are black or bisexual are at higher odds for past-year use, and those with a college degree or higher are at lower odds for past-year use. While use of Lean is not as prevalent as use of various other drugs (eg, ecstasy) in this high-risk population, over a tenth have tried it and/or are willing to use it if offered. Prevention efforts need to target potential users as frequent use of beverages containing codeine products can lead to dependence. (Am J Addict 2019;28:347-352).

Social network ties to nightlife and healthcare professionals and prescription drug misuse among young adults

BackgroundNightlife scenes have been characterized as risk environments where social ecology and network ties facilitate substance use. In contrast to other substances, the prescription drug problem also has been shaped by the healthcare system. How network ties to professionals in these domains are associated with prescription drug misuse remains a key area of study. MethodsWe analyzed a sample of 404 young adults who misuse prescription drugs, recruited from nightlife venues primarily via time-space sampling. We evaluated nine types of network ties via friends and family (5 nightlife professions and 4 healthcare professions) as well as total ties in each occupational domain and their relationship to three different outcomes – frequency of misuse, escalation to non-oral use, and substance-related problems. Negative binomial, logistic, and linear regression methods were employed. We then examined mechanisms by which these network associations may operate. ResultsTies to party promoters (p < .05) and bouncers (p < .01) were positively associated with all three outcomes. A single outcome each was associated with ties to DJs (problems, p < .01), musicians (frequency, p < .05), and bartenders (escalation, p < .05). The total number of network ties in the nightlife domain was positively associated with all three outcomes, with each additional tie increasing frequency (20.3%, p < .001), odds of escalation (OR = 42.9%, p < .01), and problems (12.5%, p < .01). The number of sources, peer norm context, and social bonding were explanatory mechanisms for all three outcomes for nightlife networks. Specific occupational ties and the total number of ties to healthcare professionals were not associated with any outcome. ConclusionEmbeddedness in nightlife networks is related to patterns of prescription drug misuse, and some of this association can be explained by multiple mechanisms of social networks. By contrast, ties to healthcare professionals are not associated with patterns of misuse among such young adults.

AgileSAR: Achieving Wide-Swath Spaceborne SAR Based on Time-Space Sampling

High resolution and wide swath, which are related to imaging quality and observation efficiency, are the key specifications for spaceborne synthetic aperture radar (SAR). Owing to the restrictions of the Nyquist sampling theorem, it is difficult to improve both specifications simultaneously. The increase of the swath width often leads to the decrease of the spatial resolution, e.g., in scanning SAR and terrain observation with progressive scan SAR. For a sparse scene, an image containing only a few targets has massive data but little useful information. This paper proposes a novel SAR observation mode, AgileSAR, which is based on the time–space sampling method and can overcome the limitations of the Nyquist theorem. It also increases the swath width while preserving the resolution of the sparse scene. AgileSAR steers the antenna beam towards a different sub-swath, generally after one or two pulse intervals, and the average pulse repetition rate corresponding to every sub-swath is much lower than that determined by the Nyquist theorem. Compared with Sentinel-1, which can achieve 5-m resolution and 80-km swath, a single azimuth-channel AgileSAR system can achieve 5-m resolution and 300-km swath for a sparse scene, once the corresponding system parameters are designed. The $\text{l}_{1}$ relaxation method is used to reconstruct sparse SAR images, and the reconstruction performance is quantitatively analyzed based on the estimation error. The simulation results validating the proposed method with sub-Nyquist samples can achieve approximately similar performance as conventional SAR with Nyquist samples.

Mindfulness and Other Psycho-Social Resources Protective Against Mental Illness and Suicidality Among Gay Men.

Background: There is considerable evidence of health disparities among gay men characterized by higher levels of stress and distress. Psycho-social resources have been linked to numerous positive health outcomes and shown to act as buffers in the stress-distress pathway.Methods: With data from the 3rd Geneva Gay Men's Health Survey carried out in 2011 using time-space sampling (n = 428), a relatively elaborate profile of 14 psycho-social resources—including mindfulness—is presented. Using their original scores, latent class analysis created an index variable dividing the respondents into meaningful groups. Psycho-social resources—the index variable as well as each resource individually—were then compared to two recent outcomes—i.e., serious mental illness in the past 4 weeks and short-term disability in the past 2 weeks—using a series of logistic regression models, controlling for all other psycho-social resources and socio-demographic confounders. To assess their potential role as buffers, a similar series of logistic regression models were erected using victimization and three outcomes—i.e., major depression, suicidal ideation, and suicide attempt—in the past 12 months.Results: According to the latent class analyses, (1) 5.1% of this sample had a low level of psycho-social resources (i.e., one standard deviation (SD) below the group means), (2) 25.2% a medium-low level, (3) 47.4% a medium level (i.e., at the group means), and (4) 22.2% a high level of psycho-social resources (i.e., one SD above the group means). Psycho-social resources appeared to strongly protect against recent mental morbidity and buffer against the impact of victimization on major depression and suicidality in the past 12 months, reducing the adjusted odds ratios below statistical significance. The explained variance and the individual psycho-social resources which remained independent in the models differed for each outcome.Conclusions: There may be disparities in several psycho-social resources among gay men, and as strong compensatory and protective factors, they may explain in part the well-established disparities in stress and distress in this population. While multiple psycho-social resources should be promoted in this population, gay men under 25 years should receive particular attention as all three disparities are most pronounced in this age group.