Posttraumatic stress disorder (PTSD) has been linked to heightened engagement in risky sexual behavior (RSB) across diverse samples, and impulsivity has been postulated as a potential linkage (Weiss et al., 2012). Limited information has been published on the role that impulsivity can play in strengthening the relationship between PTSD and RSB in college students. The current study examined the moderating role of impulsivity dispositions: negative/positive urgency, (lack of) perseverance, sensation seeking, and (lack of) premeditation on the association between PTSD symptoms and past-year RSB among a sample of 221 undergraduate students (77.4% female) with at least one DSM-5 defined traumatic event. Negative binomial regression models were conducted to explore each impulsivity disposition’s moderating effect on the relationship between PTSD symptoms and RSB. PTSD symptoms and positive urgency, (lack of) perseverance, and sensation seeking were independently associated with RSB. Significant interactions were found between negative urgency and PTSD symptoms, and (lack of) premeditation and PTSD symptoms, such that PTSD symptoms were more strongly linked to RSB among individuals high in these impulsivity dispositions. The present study expands on the limited literature on the role specific impulsivity dispositions can have in the relationship between PTSD and RSB in trauma-exposed college students.

Numerous consequences of sexual assault have been identified, including psychological consequences such as posttraumatic stress disorder (PTSD) and health-risk behaviors such as substance misuse. Previous research has indicated that survivors of sexual assault may engage in substance misuse (i.e. alcohol and other illicit and prescription drug use) in attempt to suppress negative thoughts, memories, and flashbacks of the assault. The present study seeks to expand on and examine health-risk behaviors among undergraduate college women after the experience of sexual assault. Although many researchers have focused on the use of alcohol following sexual assault, less have studied non-medical use of prescription drugs (NMUPD) as an alternative method of maladaptive coping. NMUPD has recently been identified as the fastest rising recreational substance among college populations. With NMUPD becoming a norm among college students in recreational settings, exploring NMUPD for alternative uses seems like the next logical step in research. This study views sexual assault on a continuum starting from unwanted sexual contact and ending in completed rape. This study aims to bridge the gap in research by attempting to connect the risky behavior of NMUPD to coping with any experience on the sexual assault continuum among college undergraduate women. Participants with and without a history of sexual assault were recruited for the present study. Participants completed a measure of sexual assault history and severity, along with questionnaires assessing current alcohol, marijuana, and NMUPD use

According to the CDC, young people, aged 15-24 years, share the greatest risk of new sexually transmitted diseases (STD) and the negative impact of alcohol and drug use. The purpose of this quantitative study, based on the theory of social-psychological problem-behavior, was to analyze the 2013 YRBSS secondary data and document if a relationship existed between race/ethnicity and youth sexual behavior, alcohol consumption, and drug use for the 13,583 survey participants. A Kolmogorov-Smirnov test and Chi-Square were conducted to answer the research questions. Results indicated that American Indian/Alaskan Natives were most likely to report first sexual activity before 11 years old (7.5%), while Asians were most likely to report never having sex (76.6%). Race/ethnicity also impacted all other variables, such as drugs, with a mixture of results. Hispanic/Latinos were most likely to report higher alcohol consumption (15.12%) compared to Multiple Hispanic (5.12%), while, Multiple Non-Hispanic were more likely to report use of drugs before sexual activity (9.7%) compared to Hispanic Latinos (7.99%). Social change implication of the study called for developed and effective sustainable interventions to help youth with behavior, and it required full integration of race/ethnicity as prerequisites in alleviation strategy. Dissemination plans involved use of public health campaigns, school workshops, and churches to fight the negative impact on youth.

This dissertation consists of six separate papers dealing with the valuation of financial guarantees and risky debt contract. Each of these papers is independent and distinct. The main theme is the valuation of securities by contingent claims analysis (CCA). Paper 1: Valuation of Financial Guarantees – A Presentation and a Critique.One purpose of this paper is to derive a pricing formula for a deposit guarantee, when the assets of the bank exhibit downward jumps due to extraordinary loan defaults. In this respect, we use the framework of Merton (1976), where a stock option is priced under the assumption of a jump-diffusion process for the underlying stock. Paper 2: Valuation of Deposit Insurance – An Alternative Approach.This paper extends paper 1 in the respect that the guarantor, in this case a deposit insurance agency, will nullify the guarantee contract and liquidate the bank when it gets insolvent. The liquidation is assumed to involve some costs like legal and realization costs. In fact, since the guarantee contract will never get in-the-money, the guarantee will receive value only from these liquidation costs. Paper 3: Financial Guarantees and Asymmetric Information.In this paper, we make the assumption that the guarantor cannot observe the solvency process, unless it carries out audits. This is different from the normal perfect information assumption for this kind of analysis. Since audits are often costly, and this burdens the guarantee value, the guarantor will search for an audit strategy, which minimizes the guarantee value. Paper 4: Valuation of Barrier Contracts – A Simplified Approach.Many types of financial contracts can be classified as "barrier contracts". This description comes from their feature of allowing either contractual part to take some kind of action during the lifetime of the contract contingent on some pre-specified event. In this sense, the deposit insurance contract in analysed in paper 2 can be regarded as a barrier contract. The previous valuation models of barrier contracts are often considerably advanced and have tended to obscure the underlying economics. It is the path-dependence and stopping-time features that primarily make the derivation of these pricing formulas complicated. Our model simplifies this procedure by deriving the important "first passage time" distribution from a binomial model instead of using the reflection principle. Paper 5: Valuation of Risky Debt in the Presence of Jumps, Safety Barriers and Collaterals.This paper deals with different aspects of risky debt valuation with the CCA approach. The term. "risky", refers to the probability of default on the promised payment by the borrower. Paper 6: Portfolio Selection and the Pricing of Personal Loan Contracts.The CCA literature that follows Black and Scholes (1973), has mainly taken the underlying asset dynamics for given. Although it may be appropriate for stock options, we consider this assumption too simplifying with regards to personal loan contracts. It is obvious that the borrower’s consumption-investment decision affects his wealth process, on which the loan contract is contingent. Moreover, we believe that individuals actually have preferences to repay loans for different reasons such as the existence of reputational costs or legal penalties that affect the borrower in case of loan default. / Diss. av båda förf.  Stockholm : Handelshögskolan

<p>Since the early 1980&rsquo / s when the first case of HIV was diagnosed, AIDS remains a serious and threatening health crisis in the world. Sub-Saharan Africa is the region most affected by the HIV/AIDS pandemic having 67 % of the 33 million people infected with HIV globally in 2007. Young people aged 15-24&nbsp / account for an estimated 45% of all new HIV infections worldwide. The study aimed to assess the knowledge and attitudes on HIV/AIDS and sexual&nbsp / behavior among 15-19 year olds in Kenya. A descriptive, cross-sectional survey was conducted among 96 students randomly selected from five public&nbsp / schools in Ngong sub-district. Descriptive and bivariate analysis was conducted using Epi Info 3.3 and SPSS. The main findings indicate that a third&nbsp / (31/96) of respondents were sexually experienced. Knowledge level was however found to be inadequate (below 60 %) indicating a poorly informed sample on knowledge about HIV transmission and prevention. The study showed poor attitudes towards the risk to HIV as only 40 % of both males and females supported the use of condoms even when the sexual partners know each other well. Inaddition, risky sexual behaviors were reported by sexually&nbsp / &nbsp / experienced respondents where condom use in last sexual intercourse was (57 %) among males and (20 %) among females.</p>

<p>Aim: The purpose of the study was to assess the knowledge of the transmission and prevention of HIV/AIDS among secondary school students in Bekwarra, Cross River State, Nigeria / to appraise the students&rsquo / attitudes towards HIV/AIDS / to describe the risky sexual and other behaviours they engaged in and what factors influenced such behaviours. This study was conducted in the area to systematically examine the widely held notion that adolescents were deviating from the strict sexual mores of the Bekwarra people, thereby exposing themselves to the risk of acquiring HIV. Methods: Information was collected using a cross-sectional survey based on a 64 item questionnaire adapted from the Family Health International HIV/AIDS/STD Behavioural . Surveillance Surveys. A random sample of 381 male and female students aged 14 to 18 selected from 12 secondary schools participated in the survey. Results: The level of general awareness of HIV/AIDS was high - 56.9% of participants knew how HIV is transmitted - but their knowledge of STI symptoms was low. Only 24.7% knew at least two STI symptoms in women, while only 20.7% knew at least two STI symptoms in men. One hundred and twenty three (32.2%) students constituting 68 males (17.8%) and 55 females (14.4%) had experienced sexual intercourse. The mean age at first sexual experience was 15.06 years for males and 14.95 years for female students. There was a statistical association between age and experience of sexual intercourse (p = .024). Two thirds (65.0%) of the 123 sexually experienced students had intercourse in the last six months, and only 30 of them (24.4%) had used a condom during their last intercourse. The use of condom was most frequent (10.6%) at age 18 and least frequent (.8%) at age 14. About one quarter (26.1%) of the students had taken&nbsp / alcohol: 17.3% occasionally, 5.5% moderately, and 2.6% frequently. There was a statistical association between taking alcohol and age (p = .038). Over a half (56.1%) of those who had not had sexual intercourse also had not taken alcohol. In contrast, 14.2% had sexual intercourse and also took alcohol, indicating significant statistical association (p &lt / .001). 66.8% of the students had neither used drugs nor taken alcohol, whilst 6.8% had both used drugs and taken alcohol, indicating significant association, (p &lt / .001). There was a similar association between sexual intercourse and using drugs, (p = .002). Conclusions: The study revealed significant high risk sexual behaviour among adolescents in Bekwarra. The high level of risky sexual behaviour and lack of basic knowledge about STIs indicated that access to information is currently insufficient. Health and educational authorities in Bekwarra should utilize the key findings highlighted from this study to design more effective local strategies for sexual health promotion that may help to slow the spread of STIs including HIV/AIDS. Intensive child-friendly programmes for pre-teenagers organized by educators to promote postponement of the early initiation of sexual intercourse may be effective. For adolescents who are unable to control their sexual initiation, improved education on safe sexual practices, especially the use of condoms appears to be necessary.</p>

This study examined contextual influences on the relationship between peer norms for condom use and risky sexual behavior among African-American men who have sex with men. Analyses assessed the moderating effects of socio-demographic, socio-contextual, and health-related variables. One thousand forty African-American men, who have sex with men, ages 17 to 25 years, were surveyed as part of the Community Intervention Trial for Youth (CITY) from 1999 to 2002 in Atlanta, Georgia. Findings supported the hypothesis that participants who engaged in unprotected insertive anal intercourse, socio-contextual variables moderated the relationship between peer norms and risky sexual behavior. Findings also supported the hypothesis that participants who engaged in unprotected receptive anal intercourse, both socio-demographic variables and a health variable moderated the relationship between peer norms and risky sexual behavior. Findings have implications for intervention, policy, and research, including a need for interventions that recognize the contexts of influence that shape African-American MSM sexual behavior and that support norms for consistent condom use in both steady and casual sexual relationships.

In 2005, suicide was the third leading cause of death among youth 10-24 years of age in the U.S. —accounting for 4,482 deaths. Youth suicide is an important public health problem in the U.S. and research focusing specifically on gender differences is needed and warranted since recent research shows that rates of suicide attempts have increased specifically among young girls. Analyses of the recently released 2007 YRBS data (n=14,041; girls=7,036; boys=6,992) of high school students in 9-12th grades, show that 6.9% of adolescents attempted suicide (9.3% of girls versus 4.6% of boys) and 14.5% seriously considered a suicide attempt (18.7% of girls versus 10.3% of boys). Girls are 2.89 (95% CI: 2.31-3.61) times more likely than boys to report attempting suicide in the past 12 months. Moreover, girls who reported attempting suicide were significantly more likely to also report other risk factors such as depression (OR= 5.74), weapon carrying (OR= 1.48), experiencing intimate partner violence (OR=1.60), being forced to have sexual intercourse (1.72), huffing glue (OR=2.04), and being a minority (OR 1.65). However, boys who reported attempting suicide were significantly more likely to also report weapon carrying (OR=1.66), being forced to have sexual intercourse (OR=2.60), huffing glue (OR=1.63), participating in sports (OR=1.52), depression (OR=10.96), hard drug use (OR=2.18), and being a minority (OR=1.93). Furthermore, analyses of 1991 – 2007 YRBS data revealed that these gender specific risks have remained fairly constant over time. These findings will help guide prevention and intervention strategies to prevent suicide and suicidal behaviors among both girls and boys.

<p>Abstract</p> <p>Risky foraging is a male reproductive tactic in most polygynous mammals. It is speculated to result from intense intra-sexual reproductive competition. Consequently this behavior has been speculated to increase a male's reproductive competitiveness. However, individual males may differ in their propensity to take foraging risks. </p> <p>We therefore conducted a study on crop raiding behavior (a risky foraging strategy) in African elephants from the greater Amboseli ecosystem, in southern Kenya. We specifically examined the population sizes, gender and patterns of raiding elephants and investigated the effect of crop-raiding and genetic heterozygosity on male body size. We also examined the influence of age and genetic relatedness on observed patterns of association. Finally, we examined the role of life history milestones, association patterns and social structure on the acquisition of crop raiding behavior among wild free ranging male African elephants. With regard to the influence of association patterns on crop raiding behavior, we were specifically interested in understanding the mechanisms by which social learning might occur among male elephants.</p> <p>Our results showed that 241elephants from different populations in the ecosystem converged to raid farms. Approximately 35% of raiders were from Amboseli National Park, and the rest were other populations in the ecosystem. We observed only post-pubertal males but not females to raid. About one third of post-pubertal males from the Amboseli population were raiders. We found evidence of habitual raiding by some individuals. Crop raiding predicted post-pubertal male size, with raiders being larger than non-raiders. This result suggests that taking risks pays off for males. Our results also showed that other variables known to influence growth like genetic heterozygosity had no effect on size-for-age in male elephants, because low-heterozygosity males were rare. The probability that an individual male is a crop raider was greater for older individuals than young males. The probability that a male is a raider was greater when his two closest associates were raiders versus when they were not raiders and when a male's second closest associate was older, versus when his second closest associate was of similar age or younger. These results suggest that increasing energetic demands associated with life history milestones and social learning play a significant role in the initiation of crop raiding behavior. Raiders did not cluster into separate social units from non-raiders, probably due to the nature of social learning exhibited by this species and due to the diffuse nature of male elephant social units.</p> <p>These results have implications for understanding the evolution of risky foraging behavior in males, and for understanding the role of kin selection, dominance hierarchies and social learning in male elephant social systems. Results also have implications for understanding the spread of adaptive complex behavior in natural populations.</p> / Dissertation

The thesis compared the likelihood of taking risks in dyads and individuals in varying situations. Patterns of risky decision making were examined in the standard risky choice task and a novel risk management task. The relative successes of two theories of risky decision making were assessed: Prospect Theory emphasizes perceptual and psychophysical processes, whereas Security-Potential/Aspiration Level Theory emphasizes dispositional and motivational processes. The thesis also examined dyads’ decision behavior in light of competing social influence perspectives regarding risky versus cautious shifts and group polarization. Participants, as individuals or as part of a dyad, made decisions in 23 trials about hypothetical two-outcome monetary gambles in one of two different tasks. Risky choice involved making choices between two given 50-50 lotteries which varied in riskiness (i.e., outcome variability), whereas risk management required actively manipulating an existing 50-50 risk by changing outcome values. The 23 trials were equivalent across tasks. Dyad participants communicated via an instant messenger program, while viewing the same lotteries on different computers. Data on risk preferences across gain and loss domains were analyzed using a mixed factorial ANOVA design. Consistent with Prospect Theory value function predictions, the risky choice task led to risk averse preferences for gains and risk seeking preferences for losses, though risk seeking was weak. Consistent with SP/A theory predictions, the risk management task led to overall risk averse preferences, with movement toward risk taking for gains. In addition, there was some evidence of social influences in that dyads tended to be more conservative than individuals in their decision behavior when dealing with undesirable outcomes. Thus, a cautious shift was observed, but only for lotteries involving guaranteed losses. This could not be explained by group polarization.  Each of the theories received some support, but none of them could explain all of the findings. Recommendations were made to give greater attention to defining and measuring risk attitudes and dispositions, and to continue exploring differences in decision situations and social settings to obtain a more comprehensive understanding of risky decision making processes. Findings here suggest the need for an overarching theory that can account for a wide variety of influences. A dual processes approach was recommended as one promising avenue. Social and situational influences may prove an essential part of understanding risky decision making in real life contexts.