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In electrical systems, power transformer failure prediction is a strategic procedure aimed at ensuring the uninterrupted delivery of electricity. In this context, companies of electricity employ predictive maintenance techniques to evaluate the status of this type of equipment. Aiming to contribute by adding monitoring criteria and complementing research in this field, to help maintenance teams project the future status of their power transformers immersed in insulating mineral oil with nominal voltages rated from 34.5 kV to 230 kV and above, with powers from tens to hundreds of MVA, and with and without on-load tap changer, this article presents an innovative method for projection the performance index of these assets on any given date, and to obtain a numerically reliability projection for that date. The originality of this tool stems from its combined use of two easy-to-implement mathematical criteria, considering the historical results of current and previous maintenance dielectric and electrical tests: the Weighted Moving Average and the Consistency of the Historical Neighborhood. Thus, this method is expected to contribute to more accurate to decisions making by maintenance teams.

The development of polymeric fibers incorporated with nickel (Ni) nanoparticles (NPs) has gained broad interest due to its applications, mainly for impurities removal from oil with the aid of magnetic field. In the present study, poly(vinylidene fluoride) (PVDF) fibers containing Ni NPs were produced by solution blow spinning (SBS) technique. Scanning electron microscope (SEM) measurements showed fibers with an average diameter of 564 nm, randomly dispersed without a preferred orientation. X-ray spectrum shows peaks related to Ni showing that Ni NPs were incorporated into the fibers. The magnetic analysis of the nanocomposite shows the hysteresis loops typical of ferromagnetic behavior and ZFC-FC curves revealed the presence of superparamagnetic behaviour and an average blocking temperature of 165 K. The results achieved in this work showed that is possible to produce fibrous material, using SBS technique, with unusual magnetic properties that may be applicable in various fields, including different areas of technological industry. [ABSTRACT FROM AUTHOR]

The purpose of this present study was to compare the effect of different loading intensities on the psychophysiological response between bodybuilders and active individuals in resistance exercises for upper and lower limbs. Twelve male subjects were previously selected, of which 6 were bodybuilding athletes (B) (age = 31.17 ± 7.88 yrs old; body mass = 90,62 ± 6,41 kg; height = 171.35 ± 2.39 cm; %body fat = 10.12 ± 1.64) and 6 were active individuals (A) (age = 26.5 ± 6.5 yrs old; body mass = 84.03 ± 9.12 kg; height = 177.83 ± 6.39 cm; %body fat = 14.01 ± 5.44), for the performance on one-repetition maximum test (1RM) in the bench press and leg extension exercises. The subjects performed 2 sets of 5 reps for each of the above exercises at pre-defined relative intensities (40% and 80% of 1RM) with a 3-min interval between sets. Data from the perceptual responses were collected at the end of each set using the Borg CR100 Scale. Significant differences of RPE were found between the groups in the bench press exercise at 40% load (B = 30.17 ± 8,52; A = 40.50 ± 3,94) and 80% load (B = 75.33 ± 2.58; A = 84.83 ± 3.06) of 1RM, while in the leg extension exercise, significant differences were found between groups only in the 80% load (B = 77.50 ± 4.04; A = 83.17 ± 3.06) of 1RM. The findings indicate that no significant differences were found when comparing RPE between exercises. However, perceptual responses were different among the proposed intensities, showing that the training level interferes with the psychophysiological response to resistance training. [ABSTRACT FROM AUTHOR]

The purpose of this study was to identify the presence of formaldehyde in some fresh fish commodities and to trace formaldehyde distribution in Bandar Lampung City. The formadelhyde tests were done on the storage water of fresh fish samples. The study conducted in July to October 2013 was devided in two stages: a survey to fill out a questionnaire to a number of respondents, followed by sampling some storage water of fresh fish to be tested in the laboratory. The tests were carried out on 52 sampling points taken from the fishing boats in the fishing landing port (17 boats), fish supplier car from outside Bandar Lampung (6 cars) as well as some fish sellers in 5 traditional market in Bandar Lampung (29 sellers). By conducting a laboratory test using Formaldehyde Test Kit, there were 2 samples that were purple (positively contain formaldehyde), which were taken from 2 boats in fish landing port of Lempasing. Then the assertion test was carried out to the positive samples using chromotropic acid (SNI 01 – 2894 – 1992). The results showed that the samples positively contained formaldehyde indeed, which was characterized by a bluish purple color. Based on the survey results and tracking, there was a distortion of formaldehyde distribution in Bandar Lampung, where domestic industries (including fisherman) obtained formaldehyde illegally, either from End Users, a local manufacturer or drugstore/hospital/other health care facilities. Key word: formaldehyde, fresh fish storage water, distribution distortion.

Juncus is the largest genus of Juncaceae and was considered holocentric for a long time. Recent findings, however, indicated that 11 species from different clades of the genus have monocentric chromosomes. Thus, the Juncus centromere organization and evolution need to be reassessed. We aimed to investigate the major repetitive DNA sequences of two accessions of Juncus effusus and its centromeric structure by employing whole-genome analyses, fluorescent in situ hybridization, CENH3 immunodetection, and chromatin immunoprecipitation sequencing. We showed that the repetitive fraction of the small J. effusus genome (~270 Mbp/1C) is mainly composed of Class I and Class II transposable elements (TEs) and satellite DNAs. Three identified satellite DNA families were mainly (peri)centromeric, with two being associated with the centromeric protein CENH3, but not strictly centromeric. Two types of centromere organization were discerned in J. effusus: type 1 was characterized by a single CENH3 domain enriched with JefSAT1-155 or JefSAT2-180, whereas type 2 showed multiple CENH3 domains interrupted by other satellites, TEs or genes. Furthermore, while type 1 centromeres showed a higher degree of satellite identity along the array, type 2 centromeres had less homogenized arrays along the multiple CENH3 domains per chromosome. Although the analyses confirmed the monocentric organization of J. effusus chromosomes, our data indicate a more dynamic arrangement of J. effusus centromeres than observed for other plant species, suggesting it may constitute a transient state between mono- and holocentricity., (© 2024 The Authors. The Plant Journal published by Society for Experimental Biology and John Wiley & Sons Ltd.)

Background: Despite regular consultation between adolescents/young adults (AYA) and their physicians, they are not regularly screened for psychosocial risk behaviours. This study examines physicians' self-reported psychosocial risk behaviour screening in AYA. It aims to highlight which elements hinder or improve screening abilities., Methodology: The design was a cross-sectional quantitative survey. Data were obtained through a self-reported questionnaire sent out to primary care physicians (PCP) in Switzerland in 2018. The target population consisted of 1,824 PCP (29% response rate). Participants were asked whether they screened youths from 3 age groups [10-14 y/o, 15-20 y/o, and 21-25y/o] for the HEEADSSS items during child well visits and routine checkups. Barriers to screening included primary consultation motive prioritization, insufficient time, patient compliance, reimbursement, lack of skills related to adolescent health, lack of referral options. Data were analysed first through a bivariate analysis using Chi-square tests then through a multinomial logistic regression., Results: The majority of physicians partook in preventive screening for 3-5 psychosocial risk elements. They reported the primary consultation motive as well as a lack of available time as having a high impact on their screening habits. Physician's experience and having discussed confidentiality were related to an increase in the number of topics addressed. Confidentiality remained a significant variable throughout all analyses., Conclusion: Barriers such as lack of consultation time and prioritization issues were found by physicians to be critical but did not hinder screening habits. The main element impacting screening habits was assuring confidentiality and the second is self-efficacy., (© The Author(s) 2023. Published by Oxford University Press.)

Digital media and screens are ubiquitous in the daily lives of adolescents. The screen-addicted portrait of young people has gained public attention, and health professionals are often consulted about the impact of screen use on teenagers' physical and mental health. Scientific evidence suggests that screen use is associated with risks and benefits that need to be weighed up in a nuanced way. This paper takes a critical look at the issue of screen time and at the models for understanding a problematic screen use. These considerations underline the importance of adopting a contextual understanding of screen use in adolescence., Competing Interests: Daphné Bavelier déclare être membre fondatrice d’Akili Interactive, Boston. Les autres auteur-es n’ont déclaré aucun conflit d’intérêts en relation avec cet article.

This study explores the characteristics of young female and male adults (mean age 26.3 years) reporting a low sexual desire. A 2017 Swiss national survey was carried out among young adults. Participants were divided into two groups based on their level of sexual desire: Low and High. Overall, 17.2% of females and 5.7% of males reported a low sexual desire. At the multivariate level, compared to females in the High group, females in the Low group had higher odds of being dissatisfied with their social life and with their sexual life in the past 4 weeks, having no current relationship and having accepted several times sexual intercourse without really wanting. Compared to males in the High group, males in the Low group had higher odds of reporting a non-heterosexual attraction (trend), having no current relationship and having accepted several times sexual intercourse without really wanting. The prevailing idea that young people, particularly males, always have high levels of sexual desire may not be accurate and warrants further consideration. These results show that sexual desire encompasses social aspects and underscore importance of addressing how stereotypes and social norms may influence our sexuality., Competing Interests: Competing interestsThe authors have no conflicts of interest to disclose., (© The Author(s) 2023.)

Aim: To compare the evolution of screen and Internet use by youths between 2012 and 2020 in Switzerland., Methods: Cross-sectional studies of 10th-graders (age 13-14) were performed in Switzerland in 2012 and 2020, and compared in bivariate and multivariate analyses on sociodemographic, schooling, physical activity, emotional well-being, and screen use variables., Results: We found that screen use had shifted to smartphones with 71.7 % of youths primarily using this device in 2020 compared to 23.2 % in 2012. In association with this change, young people's screen time had increased dramatically with an odds ratio (OR) of 11.90 for adolescents spending more than 4 h in front of screens in 2020 compared to 2012. No changes were found in the score on the Internet Addiction Test (IAT) to detect problematic screen use and for adolescents' emotional well-being. Furthermore, youths in 2020 engaged in less physical activity lasting 60 min daily, but the frequency of their extracurricular sport participation remained unchanged., Conclusions: Young people spend more time on screens, especially because of an increase in smartphone use in 2020. However, youths do not seem to show more problematic behaviors regarding screen use, nor has this development affected their emotional well-being. The daily and continuous use of new devices is now an integral part of young people's lives. This process seems to be part of the growth of the digital world. However, Internet and screen addiction scales should be adapted to ensure that adolescents in need of help and counseling are identified., Competing Interests: Declaration of Competing Interest Authors declare that they have no conflict of interest., (Copyright © 2023 The Authors. Published by Elsevier Masson SAS.. All rights reserved.)

Objective: One of the main concerns of parents is the amount of screen time of their teenagers, and most of them try to set rules about it. The objective of this exploratory study was to compare whether parents' rules changed during confinement and whether these changes were successful., Methods: We studied a group of parents (N = 47) of 13-year-olds in Switzerland surveyed before and during the COVID-19 pandemic., Results: Most parents (83%) indicated that screen-time rules for their teens had changed during containment, mainly to be less strict. Although only a minority of parents were successful in defining screen-time spaces or schedules for their teenagers, almost three out of four were successful when they encouraged non-screen-based activities., Conclusions: This exploratory study reveals that, during containment, parents decided to be less strict with their teens' screen-time use even though it remained their main worry. However, it also suggests that when activities non-involving screens are proposed, teens are likely to participate. These results seem to indicate that reducing screen time is not a matter of imposing restrictions but, rather, of proposing alternatives. Finally, further research is warranted to assess whether these changes in screen-time use are exceptional or here to stay., (© 2022 John Wiley & Sons Ltd.)

Background : Youth alcohol use and misuse lead to adverse outcomes. However, the literature has not always associated complete abstinence with better health. Since recent literature indicates an increased proportion of young abstainers, the aim of this paper is to review the studies investigating this upward trend and the factors associated with it, such as socio-demographics, school performance, social life, physical and mental health, and parental influence. Methods : Different databases were searched and appropriated terms were used. Given that the trend has only emerged in recent years, the review was limited to papers published since 2000. A total of 970 papers were returned and 10 were retained for the present review. Results : All papers covered by the review acknowledge the existence of a new significant trend resulting in more young people in developed countries who are choosing to abstain completely from drinking alcohol. They are in good physical and mental health and perform better at school than their drinking peers. The quality of their social life, albeit slightly more limited than that of their drinking peers, appeared to be good. Conclusion : Young alcohol abstainers represent a group situated at the beginning of a continuum of alcohol consumption, they do well and are not very different from light drinkers. Alcohol abstinence at young age does not seem to have any downsides and should therefore be generally advised. To further promote such behavior, measures to encourage parental monitoring and more generous public expenditure on health services and family benefits should be encouraged.

Purpose: Emergency contraception (EC) access was liberalised in 2002 in Switzerland by making it accessible in pharmacies without medical prescription. However, its dispensation still requires a confidential interview with a pharmacist. This qualitative study aims to explore experiences of adolescent and young adult (AYA) females who have gone to a pharmacy in order to obtain EC., Materials and Methods: Thirty interviews were conducted from April to August 2019 with females aged between 15 and 25 years old at the interview. Inclusion criteria was to have requested at least one EC in a pharmacy between 2014 and 2019. A thematic content analysis was performed to extract themes brought up by the participants., Results: Some participants reported that the most difficult moment in the process was the request at the counter. The majority of participants were escorted in a private back room but opinions were divided regarding this isolation. Experiences were sometimes negative due to lack of information and knowledge regarding the dispensation process. The interview also has also a preventive aim, but the information given during it often focussed solely on the risk of vomiting. Several participants reported having perceived or received moral judgements from pharmacists., Conclusions: Pharmacists are key resources and EC dispensation an opportunity for sexual health. This exploratory study presents several elements requiring the adaptation of practices in order to prevent them from becoming barriers for AYA to access EC. Concerns are regularly expressed by young women about privacy, embarrassment and judgement in the pharmacy context regarding contraception.

The centromere represents a single region in most eukaryotic chromosomes. However, several plant and animal lineages assemble holocentromeres along the entire chromosome length. Here, we compare genome organization and evolution as a function of centromere type by assembling chromosome-scale holocentric genomes with repeat-based holocentromeres from three beak-sedge (Rhynchospora pubera, R. breviuscula, and R. tenuis) and their closest monocentric relative, Juncus effusus. We demonstrate that transition to holocentricity affected 3D genome architecture by redefining genomic compartments, while distributing centromere function to thousands of repeat-based centromere units genome-wide. We uncover a complex genome organization in R. pubera that hides its unexpected octoploidy and describe a marked reduction in chromosome number for R. tenuis, which has only two chromosomes. We show that chromosome fusions, facilitated by repeat-based holocentromeres, promoted karyotype evolution and diploidization. Our study thus sheds light on several important aspects of genome architecture and evolution influenced by centromere organization., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2022 The Author(s). Published by Elsevier Inc. All rights reserved.)

Understanding risky sexual behaviors among adolescents is key in efforts devoted to reducing the health burden related to sexually transmitted infections and unintended or unplanned pregnancies. The aims of this study were to understand the association between number of lifetime sexual partners and time since sexual debut (TSSD) among adolescents and to determine whether sex modified this association. Data were drawn from the 2018-2019 COMPASS-Quebec study, a cohort study conducted in secondary schools in the province of Quebec, Canada. Of 18,467 respondents aged 14 years and older, 6991 (37.9%; mean age 15.3) reported consensual sexual intercourse and answered questions on their age at sexual initiation and number of lifetime sexual partners. Multilevel Poisson regressions with robust standard errors were estimated to adjust for covariates and produce adjusted group mean differences. The adjusted mean number of lifetime sexual partners ranged from 1.5 for those who had recently begun sexual activity (< 12 months) to 4.0 for those who had been active for > 35 months, an average rise of about 0.6 per year. Females-to-males adjusted mean differences showed that males reported more sexual partners than females at all time points, but the differences were only significant at the shorter (< 12 months) and longer (> 35 months) time spans. This study highlights the importance of taking into account TSSD when using and interpreting the number of lifetime sexual partners as risky sexual behavior among adolescents. Sex did not have a significant modifying effect on the relationship between number of lifetime sexual partners and TSSD., (© 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)

Background: There is a gap in the literature regarding data on sexting among youth under the age of 16 whereas the problems related to this practice could affect them more because of their ongoing development. This study aims to determine the prevalence rate and characteristics of sending one's own sexually related image among middle-school teens., Methods: Data were obtained from a web-based in-school survey conducted between October 2019 and February 2020. The sample comprised 3006 (mean age 13.7; 50.2% males) 10th-grade pupils in the canton of Vaud (Switzerland). Participants were asked "Have you ever sent a sexually related/sexy image of yourself?". Analysis of variance/chi-square tests and multinomial regression analyses were used to compare the groups., Results: Overall, 93.0% reported never, 3.7% once and 3.3% several times. No gender differences were found. Sending was associated with older age, low academic performance, cyberbullying victimization and reception of unsolicited sexually related images., Conclusions: Education and health professionals should be aware that it is necessary to discuss the theme, perhaps with a more global approach including pressure, consent, exchange of nonsexual images, and so on from an early age. The context and reasons for sending remain to be explored, particularly to determine if the pressure is greater at this age., (© 2022 The Authors. Journal of School Health published by Wiley Periodicals LLC on behalf of American School Health Association.)

Background The aim of this research was to determine the prevalence and characteristics of youths having ever exchanged sex and to assess if there were differences depending on whether they had done it once or several times. We also investigated what they exchanged sex for and their relationship with the last person they did it with. Methods A cross-sectional national survey was carried out in Switzerland in 2017 among young adults. The 5175 participants (51% males, mean age 26.3years) who answered the question 'Have you ever received something or obtained an advantage in exchange for a sexual act?' were divided into three groups: Never (96.8%), Once (1.5%) and Several (1.7%). Results In the multivariate analysis, compared to the Never group, those in the Once group were significantly more likely to be males, to have a poor mental health, to be non-exclusively heterosexual and to have had 10+ lifetime sexual partners. Those in the Several group reported the same characteristics, but were also more likely to be younger at first sexual contact, to have their parents not living together, to report a lower socioeconomic status and a history of sexual abuse, and to have ever sent sexual images/videos of themselves. They were also less satisfied with their financial situation. Conclusions Results indicate that transactional sex is a reality for some youths in Switzerland, and health professionals dealing with them should include this question in their sexual anamnesis. From a public health perspective, sexual education and prevention campaigns should include this phenomenon.

Background: The transmission dynamics of SARS-CoV-2 varies depending on social distancing measures, circulating SARS-CoV-2 variants, host factors and other environmental factors. We sought to investigate the clinical and epidemiological characteristics of a SARS-CoV-2 outbreak that occurred in a highly dense population area in Colombo, Sri Lanka from April to May 2020., Methodology/principal Findings: We carried out RT-qPCR for SARS-CoV2, assessed the SARS-CoV-2 specific total and neutralizing antibodies (Nabs) in a densely packed, underserved settlement (n = 2722) after identification of the index case on 15th April 2020. 89/2722 individuals were detected as infected by RT-qPCR with a secondary attack rate among close contacts being 0.077 (95% CI 0.063-0.095). Another 30 asymptomatic individuals were found to have had COVID-19 based on the presence of SARS-CoV-2 specific antibodies. However, only 61.5% of those who were initially seropositive for SARS-CoV-2 had detectable total antibodies at 120 to 160 days, while only 40.6% had detectable Nabs. 74/89 (83.1%) of RT-qPCR positive individuals were completely asymptomatic and all 15 (16.9%) who experienced symptoms were classified as having a mild illness. 18 (20.2%) were between the ages of 61 to 80. 11/89 (12.4%) had diabetes, 8/89 (9%) had cardiovascular disease and 4 (4.5%) had asthma. Of the two viruses that were sequenced and were of the B.1 and B.4 lineages with one carrying the D614G mutation., Discussion/conclusion: Almost all infected individuals developed mild or asymptomatic illness despite the presence of comorbid illnesses. Since the majority of those who were in this underserved settlement were not infected despite circulation of the D614G variant, it would be important to further study environmental and host factors that lead to disease severity and transmission., Competing Interests: The authors have declared that no competing interests exist.

Anal intercourse (AI) among heterosexuals is an understudied and taboo subject. This 2017 Swiss national study aimed to describe the characteristics and motivations of heterosexual young adults practicing AI. Participants with any same-sex experience, same-sex attraction or non-heterosexual identity were excluded. The Federal Statistical Office provided the initial sample and potential participants were recruited through postal mail inviting them to an online survey (response rate 15.1%). The sample comprised 3892 participants (52% males; 54% of the overall sample, mean age 26.3 years). Overall, 55% of women and 56% of men had never experienced AI, 17% and 12% had done it once and 28% and 32% more than once, respectively. We found that participants engaging in AI had higher odds of practicing intercourse while intoxicated, being younger at first sexual experience, not using a condom at last intercourse and reporting a history of sexual transmitted infections. The main reason reported by both genders for engaging in their first AI was being curious followed by being in love. In conclusion, AI is a widespread practice among heterosexual young adults and health professionals should be especially attentive to it.

Background Studies on virgins remain scarce. This study explores the characteristics of virgin young adults, the reasons for remaining virgin, and its potential social and health implications., Methods: Data were drawn from the 2017 Swiss study on sexual health and behaviour among young adults. A total of 5175 participants (mean age 26 years ± 0.01) were divided into virgins and non-virgins. Virginity was defined as never having had a sexual partner, defined as a person with whom the participant has had sexual contact with or without penetration., Results: A total of 275 (5.3% (95% CI: 4.7-6.0), 58% males) were virgins. Virgins had higher odds of being male (aOR: 2.27 (95% CI: 1.62-3.17)) and reporting poorer health (1.43 (1.07-1.92)). They had lower odds of living on their own (0.24 (0.18-0.32)), being satisfied with their social life (0.78 (0.72-0.85)), having experimented with substances (e.g. drunkenness, 0.27 (0.19-0.67)) and having used online dating (0.52 (0.26-1.12)) or pornography (0.67 (0.42-0.94)). The main reason for remaining virgin was 'I have not found the right person' for females, and 'I have not had the occasion' for males., Conclusions: Among young adults, 1 in 20 is a virgin. Virgins do not seem to have gone through the usual experimentations of adolescence, are less socially driven and reported more health challenges. The main reason for remaining a virgin reveals gender-stereotyped responses. Sexual inactivity among young adults should be considered by health professionals to ensure the absence of distress and open discussion for potential questions.

Objective: To compare the characteristics of and use of the healthcare system by healthy youths depending on whether they had discussed transition to adult health care with their paediatrician or not., Methods: Data were drawn from the fourth wave of the GenerationFRee study (2018-2019) conducted in the 11 post-mandatory schools of the canton of Fribourg, Switzerland. The sample included 931 young people (mean age 19.4 years). Participants were categorised into three groups: those who had discussed transition with their p ediatrician (n = 176; 19%), those who had not (n = 286; 31%) and those who did not know (n = 469; 50%). Analyses were stratified by gender through bivariate analysis and post-hoc tests with a Bonferroni-type adjustment., Results: The majority of participants did not know whether or not they had discussed transition. Across all groups, it was found that youths met their primary care physician at a higher rate through family. Meeting with the primary care physician through the paediatrician occurred at a higher rate when youths had discussed transition. Girls with a below average socioeconomic status and boys with advanced puberty onset were more likely to have discussed transition., Conclusion: Our results show that youths are not well informed about the transition process. However, youths who have discussed transition appear to be more involved with the healthcare system as they are more likely to have a primary care provider. In order to avoid discontinuity of care, professionals should approach transition to adult care systematically with all their patients.

What Is Known on the Subject: Good practice and knowledge in terms of contraception at first sexual intercourse may lead adolescents to a safer sexual life. To date, research studies have mostly focused on women when investigating contraception use or on condom use only when addressing both genders., What Does This Article Add: The present study adds to the current knowledge by offering a more in-depth view of contraception use at first intercourse among youths. This is achieved through a large selection of variables, the fact that we address both males and females and that we have considered a wide range of contraceptive means., Aim of the Study: To determine the rate of contraception use at first intercourse by youth in Switzerland and its association with social and personal characteristics., Methods: Data were obtained from a self-administrated national survey on sexual behaviour among young adults (mean age 26 years). Participants (n = 4036) were divided into three groups based on the means of contraception used at first intercourse: condom, with or without contraceptive (86.4%), contraceptive only (8.3%) and non-use (5.3%)., Results: Only 5.3% did not use any contraception. Compared with the condom group, individuals in the non-use group were more likely to report a lower family socioeconomic status, to be foreign born, to have foreign-born parents, to have a non-intact family and to live in a Catholic canton. They were also more likely to have had their first intercourse in the context of a casual relationship, to have been intoxicated at the time and more likely to regret it. Participants in the contraceptive group reported a higher family socioeconomic status, had intact families, did not live in Catholic cantons, were older and in a steady relationship at first intercourse., Conclusion: Contraception is generally used at first intercourse in Switzerland. Improvements can still be made concerning contraception use in the most vulnerable social strata such as low income families or foreign status.