Daily Associations Between Drinking and Sex Among College Students: A Longitudinal Measurement Burst Design

Daily links between alcohol use and sexual behaviors were examined in a longitudinal study of college students. Hierarchical linear models predicted sexual behaviors by characteristics of persons (N = 731, Level 3), semesters (N = 4,345, Level 2), and days (N = 56,372, Level 1). On a given day, consuming more drinks and binge drinking were associated with greater odds of kissing, touching, oral sex, and penetrative sex. Consistent with alcohol myopia and expectancy theories, associations between binge drinking and sexual behaviors were stronger for students not in romantic relationships, for students with stronger alcohol–sex expectancies, and for oral and penetrative sex. Findings suggest that within‐day links between alcohol use and sexual behaviors are evident across college, with variations based on individual and relationship factors.     

Rise and Fall of Sleep Quantity and Quality With Student Experiences Across the First Year of University

Covariations of self‐reported sleep quantity (duration) and quality (disturbances) with affective, stressful, academic, and social experiences across the first year of university in 187 Canadian students (M age=18.4) were examined with multilevel models. Female students reported sleeping fewer hours on average than did male students. In months when negative affect and general levels of stress were higher, sleep quantity was lower. Poorer sleep quality was seen in students living away from home and reporting more financial stress at baseline. In addition, sleep quality was poorer in months when negative affect and general levels of stress were higher (attenuating the effect of financial stress) and better in months when students spent more days with friends. Three themes are presented to explore the mechanisms by which sleep quantity and quality rise and fall in tandem with experiences of the first year of university.     

The simulation of industrial robot systems

This paper describes the GRASP computer aided design system for modelling and evaluating industrial robot workplaces. GRASP satisfies a range of simulation needs within the context of designing, implementing and operating industrial robotic systems. The GRASP software may be used to investigate robots operating by themselves or, more likely, as part of an integrated cell. Facilities within GRASP assist workplace layout, position and velocity evaluations, clash detection and co-ordination between items. A robot library exists and is being extended, and an embryo off-line programming facility has been used under restricted conditions. GRASP has been used to help solve a wide range of practical industrial robot problems and has proved itself technically, and also as an educational tool, by showing how a proposed system would operate. The paper describes the facilities within GRASP.     

How do we capture 15 years of complex and meaningful data about young people's lives?

Abstract

This paper describes the development of a method of data collection, which captures the complexity of living situations, family dynamics and key life events of teenagers. This ‘Life History Calendar’ was adapted from earlier life history calendar methods for a multidisciplinary intergenerational study. The new calendar is able to record details of 15 years of teenage participants’ lives and can be administered to teenagers and their parents to show changes over individual lives and difference between individuals in a cohort. Referring to some preliminary data, we show that the calendar is a practical and effective method of data collection, which will be useful to researchers and practitioners working with young people and their families.     

Changes in Diverse Sexual and Contraceptive Behaviors Across College

Researchers have made repeated calls for a better understanding of normative sexuality development during adolescence and young adulthood. We examined how the occurrence of seven penetrative, nonpenetrative, and contraceptive behaviors changed longitudinally across seven waves, and how individual (gender) and contextual (romantic relationship status) factors related to these changes in a sample of college students (N = 730, M age = 18.4 at Semester 1; 51% female; 26% Hispanic/Latino American, 22% Black/African American, 30% Asian American/Pacific Islander, 45% White/European American). Across college, reported kissing, touching, performing and receiving oral sex, and penetrative sex rates increased, and contraception use (any type) and condom use (in particular) rates decreased, demonstrating changes with age independent of young adults’ romantic relationship experiences. Rates of all sexual behaviors were higher, and of contraception use lower, when students were in serious romantic relationships. Contraception use decreased more for men than for women, particularly in semesters men were not in serious relationships. Condom use decreased for men, and for women in semesters they were in serious relationships. Findings demonstrate normative trends in sexuality development, as well as suggesting the value of enhanced sexual health promotion programming, with a particular focus on contraceptive behaviors, across college.     

Reasons to have sex, personal goals, and sexual behavior during the transition to college

Emerging adults (M = 18.99 years, SD = .50) completed cross-sectional questionnaires (N = 943) and targeted follow-up telephone surveys (N = 202) across the transition to college. Gender, personal goals (dating, friendship, academic), and past sexual behavior were examined as predictors of reasons to have and not to have sex. Men rated Self-focused reasons to have sex as more important; women rated Partner-focused reasons to have sex and Ethical reasons not to have sex as more important. Importance of Pregnancy/STD reasons not to have sex did not differ by gender. Before college entrance, sexual history and personal goals predicted endorsement of reasons for/against sex. Personal goals predicted first intercourse during freshman year. Limitations of the study include the single university sample and use of closed-ended self-report measures. Personal goals and reasons for/against sex are associated with sexual behavior and should be addressed in programs designed to promote sexual health among emerging adult college students.     

Short-term positive and negative consequences of sex based on daily reports among college students

Because sexual behavior may be associated with a broader range of outcomes than physical consequences like sexually transmitted infections and pregnancy, it is important to understand consequences of sex that may influence mental and social well-being in emerging adulthood. This article describes the short-term intrapersonal and interpersonal consequences reported by college students on days they engage in vaginal sex and what factors predict experiencing particular consequences. Data are from first-year college students who reported vaginal sex on at least one of 28 sampled days (mean age = 18.5 years; 53% female; 30% Hispanic/Latino [HL]; of non-HL participants, 30% were African American, 22% were Asian American, 35% were European American, and 12% were multiracial; N = 209 people and N = 679 person days). Participants reported positive consequences more frequently than negative consequences. Non-use of contraception and sex with a non-dating partner were associated with greater odds of reporting negative consequences. These findings have implications for messages about casual sex and use of contraception in sex education and sexual health programming.     

Losing Sleep Over It: Daily Variation in Sleep Quantity and Quality in Canadian Students' First Semester of University

Daily covariation of sleep quantity and quality with affective, stressful, academic, and social experiences were observed in a sample of Canadian 17–19‐year‐olds in their first year of university. Participants (N=191) completed web‐based checklists for 14 consecutive days during their first semester. Multilevel models predicting sleep quantity and quality from daily experiences indicated that more time on schoolwork, expecting a test, and alcohol use predicted less sleep whereas socializing predicted more sleep. More positive affect and no alcohol use predicted better sleep quality. Models predicting daily experiences from sleep the night before indicated that less sleep preceded increases in negative affect, decreases in schoolwork time, and a higher likelihood of socializing. Better sleep quality preceded increased positive affect, decreased negative affect and stress, and less time on schoolwork. These data are informative for understanding relations between sleep and daily experiences as they occur naturally in first‐year university students.     

The association of smoking with drinking pattern may provide opportunities to reduce smoking among students

There is evidence that smoking and alcohol consumption are paired behaviours among university students, but we know little about how New Zealand students engage in these behaviours. We estimated prevalence of daily and occasional smoking among university students, and associations of smoking with drinking patterns, demographics and smokefree policies of the university. This research was conducted with 2822 university students, aged 17–25, from five New Zealand universities who participated in an online health survey in 2013. Fourteen percent reported they currently smoke occasionally, and 3% reported smoking on a daily basis. Increasing age, living situation, drinking more often, and drinking more alcohol during drinking occasions were all associated with greater levels of smoking. Understanding patterns of smoking in relation to alcohol consumption may help efforts to further reduce smoking prevalence. Specifically, policy makers should consider approaches that de-couple tobacco and alcohol consumption, such as expanding the smokefree perimeter of bars and disallowing the sale of tobacco at premises licensed to sell alcohol.