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PubMed2006

Clustering of risk behaviors with cigarette consumption: A population-based survey.

OBJECTIVE: This study assessed clustering of multiple risk behaviors (i.e., low leisure-time physical activity, low fruits/vegetables intake, and high alcohol consumption) with level of cigarette consumption. METHODS: Data from the 2002 Swiss Health Survey, a population-based cross-sectional telephone survey assessing health and self-reported risk behaviors, were used. 18,005 subjects (8052 men and 9953 women) aged 25 years old or more participated. RESULTS: Smokers more frequently had low leisure time physical activity, low fruits/vegetables intake, and high alcohol consumption than non- and ex-smokers. Frequency of each risk behavior increased steadily with cigarette consumption. Clustering of risk behaviors increased with cigarette consumption in both men and women. For men, the odds ratios of multiple (> or =2) risk behaviors other than smoking, adjusted for age, nationality, and educational level, were 1.14 (95% confidence interval: 0.97, 1.33) for ex-smokers, 1.24 (0.93, 1.64) for light smokers (1-9 cigarettes/day), 1.72 (1.36, 2.17) for moderate smokers (10-19 cigarettes/day), and 3.07 (2.59, 3.64) for heavy smokers (> or =20 cigarettes/day) versus non-smokers. Similar odds ratios were found for women for corresponding groups, i.e., 1.01 (0.86, 1.19), 1.26 (1.00, 1.58), 1.62 (1.33, 1.98), and 2.75 (2.30, 3.29). CONCLUSIONS: Counseling and intervention with smokers should take into account the strong clustering of risk behaviors with level of cigarette consumption.

Adult↗
PubMed2005

HIV sexual risk behavior over 36 months of follow-up in the world's first HIV vaccine efficacy trial.

Increased risk behavior among participants in HIV vaccine efficacy trials has been a concern. This study evaluated HIV sexual risk behavior among 5095 HIV-negative men who have sex with men (MSM) and 308 women enrolled in a randomized, double-blind, placebo-controlled efficacy trial of a bivalent rgp120 vaccine at 61 sites, primarily in North America. Sexual risk behavior data were collected at baseline and semiannually for 36 months. Overall, sexual risk behavior did not exceed baseline levels during the trial. Among MSM, younger age (< or =30 years), perceived assignment to vaccine, and nonblack race were associated with an increased probability of unprotected anal sex. Among women, unprotected vaginal sex initially decreased but was statistically equivalent to baseline by 24 months, whereas unprotected vaginal sex with HIV-infected partners decreased from baseline, where it remained throughout the trial. HIV sexual risk behavior did not increase among trial participants; however, it was substantial throughout the trial. Consistently high levels of risk behavior and the association of these behaviors to perceived assignment and demographic variables underscore the need for vigilant HIV risk reduction counseling, informed consent, and educational processes in the context of HIV vaccine efficacy trials.

AIDS Vaccines↗
PubMed1997

Comparison of selected health risk behaviors between adolescents in public and private high schools in South Carolina.

This study examined differences in selected health risk behaviors among 5,517 students attending public high schools (PUBHS) and 1,089 students attending private high schools (PVTHS) in South Carolina. The 1995 CDC Youth Risk Behavior Survey was used to collect self-report information on adolescent risk behaviors. Chi-square analyses were performed for comparing public and private students on selected risk behaviors. Both PUBHS and PVTHS students reported substantial involvement in most of the risk-taking behaviors examined. PUBHS students, in general, were more likely to report higher prevalence rates than PVTHS students for most of the selected health risk behaviors. However, PVTHS students reported even higher prevalence rates than PUBHS students for alcohol use, driving after drinking, and binge drinking; smoking cigarettes (past 30 days); chewing tobacco (males only); marijuana use during the past 30 days (females only); and use of alcohol or other drugs before last act of sexual intercourse. Results suggest attendance at a private high school is not a panacea for protection against adolescent risk behaviors, and that all high school students could benefit from a coordinated school health program.

Adolescent↗
PubMed1996

The effect of socioeconomic status on chronic disease risk behaviors among US adolescents.

OBJECTIVE: To examine the relationship between socioeconomic status and risk behaviors for chronic disease among a nationally representative sample of adolescents in the United States. DESIGN: Household survey, the Youth Risk Behavior Survey supplement to the 1992 National Health Interview Survey. SETTING: United States. PARTICIPANTS: Nationally representative sample of 6321 adolescents aged 12 to 17 years. MAIN OUTCOME MEASURES: Standardized prevalence rates and logistic and multiple regression models were used to examine the effect of educational level of the responsible adult and family income on 5 risk behaviors for chronic disease among adolescents--cigarette smoking, sedentary lifestyle, insufficient consumption of fruits and vegetables, excessive consumption of foods high in fat, and episodic heavy drinking of alcohol. RESULTS: Most adolescents (63%) reported 2 or more of the 5 risk behaviors. Controlling for age, sex, race/ethnicity, and school enrollment status of adolescents, as the educational level of the responsible adult increased, cigarette smoking, sedentary lifestyle, and insufficient consumption of fruits and vegetables were less likely among adolescents. Among girls, but not boys, consumption of foods high in fat decreased as education of the responsible adult increased. As family income increased, adolescents were less likely to smoke cigarettes, less likely to be sedentary, and less likely to engage in episodic heavy drinking. CONCLUSION: Among adolescents, risk behaviors for chronic disease are common and inversely related to socioeconomic status. Improved community- and school-based programs to prevent such behaviors among adolescents are needed, especially among socially and economically disadvantaged youth.

Adolescent↗
PubMed2005

Educational attainment but not literacy is associated with HIV risk behavior among incarcerated women.

PURPOSE: To identify the educational factors associated with HIV risk behaviors among incarcerated women. METHODS: We evaluated a cohort of female detainees at The Rhode Island Adult Correctional Institute between July and September 2004. Among the 423 women who participated in the study, 55% did not have a high school diploma, 29% had < or = 8th grade reading capacity, 32% had a learning disability, 37% had problem drinking, and 61% (257/423) reported HIV risk behavior. RESULTS: In multiple logistic regression, participants who had completed high school had the lowest likelihood of HIV risk behavior (adjusted odds ratio [OR] 0.35, 95% confidence interval [CI] 0.12-1.00). There was no association between participants? literacy level and HIV risk behavior (adjusted OR 2.02, 95% CI 0.83-4.92). CONCLUSIONS: Correctional education programs to reduce HIV risk behavior should focus on those with low educational attainment irrespective of literacy skills.

Adult↗
PubMed2002

Risk factors for cognitive impairment in HIV-1-infected persons with different risk behaviors.

CONTEXT: Although it is well established that acquired immunodeficiency syndrome dementia complex mainly develops in patients with advanced human immunodeficiency virus 1 (HIV-1) infection and severe immunosuppression, other factors that might increase the risk of early neuropsychological abnormalities are controversial. OBJECTIVE: To identify risk factors for HIV-1-related cognitive impairment. DESIGN: Case-control study. SETTING: Division of Infectious Diseases, University of Bologna. PARTICIPANTS: We studied 272 consecutive individuals: 90 HIV-1-seronegative, 88 asymptomatic HIV-1-seropositive, and 94 symptomatic HIV-1-seropositive persons. MAIN OUTCOME MEASURES: Cognitive impairment was defined as poor performance on at least 2 of the 7 neuropsychological tests included in the battery. Cutoff scores for poor performance on a test were established as 2 or more SDs lower than the mean of the seronegative group in the corresponding risk behavior strata: injecting drug users, hemophiliacs, and other risk behaviors. The following risk factors were studied: age, sex, education, risk behaviors, HIV-1 stage, lymphocyte count, and antiretroviral therapy. RESULTS: Compared with individuals with higher levels of education, those with less than 6 years of schooling had an odds ratio (OR) of 17.2 (95% confidence interval [CI], 3.6-83.3) for cognitive impairment, independent of age, sex, disease stage, antiretroviral therapy, and risk behavior. Compared with injecting drug users, homosexual/bisexual and heterosexual participants had ORs of 9.6 (95% CI, 2.2-42.7) and 6.3 (95% CI, 2.2-18.3), respectively, for cognitive impairment. Use of antiretroviral treatment (any vs none) was associated with lower prevalence of cognitive impairment (OR, 0.1; 95% CI, 0.0-0.3). Compared with persons with high CD4+ cell counts (> or =500/microL), those with low (<200/microL) and moderate (200-499/microL) CD4+ cell counts had adjusted ORs of 8.6 (95% CI, 1.0-71.0) and 6.9 (95% CI, 1.0-48.4), respectively. The presence of prominent depressive symptoms did not change the results. CONCLUSIONS: Low educational level, low CD4+ cell count, and homosexual/bisexual and heterosexual risk behaviors are risk factors for cognitive impairment in HIV-1-seropositive persons. Antiretroviral therapy exerts a beneficial effect against cognitive impairment in symptomatic individuals. Homosexual/bisexual and heterosexual persons who survive longer are expected to be the group at highest risk for cognitive impairment. However, the protective effect of antiretroviral therapy may balance this increased risk.

AIDS Dementia Complex↗
PubMed1998

Employment and health-risk behaviors among pregnant adolescents.

STUDY OBJECTIVE: To compare health-risk behaviors, maternal, and neonatal outcomes of pregnant adolescents less than 18 years old who reported employment more than 15 hours per week with those who did not report working. We hypothesized that working teens compared with nonworking adolescents would report higher rates of health-risk behaviors. METHODS: A structured interview was conducted at the first prenatal visit and the medical chart was reviewed to extract pregnancy (pregnancy-induced hypertension, preterm labor with hospitalization, and preterm delivery) and neonatal outcomes (low birthweight, small for gestational age, and admission to the neonatal intensive care unit). The study was conducted at an outpatient maternal and child health clinic at a university teaching hospital. A total of 384 white (n=111), African American (n=151), and Mexican American (n=99) adolescents, aged 12 to 17 years, who initiated care between January 2, 1992, and December 31, 1994, and delivered an infant at our institution were consecutively sampled. A structured interview assessed various health-risk behaviors including age at first intercourse, substance use (tobacco, alcohol, and other illicit drug use), and number of sexual partners. Medical records were reviewed to obtain information on pregnancy complications (pregnancy-induced hypertension, preterm delivery, and preterm labor with hospitalization) and negative birth outcomes (infant birthweight and neonatal intensive care admission). RESULTS: Controlling for chronological age, logistic regression analyses found that adolescents reporting employment at their first prenatal visit (n=40) compared with those not employed at this visit (n=331) were more likely to be characterized by school enrollment, higher economic status, partner employment, partner alcohol use, and a longer relationship with the father of their baby. Multivariate logistic regression found that employed females were 4.6 times more likely to deliver a small-for-gestational-age infant. CONCLUSIONS: Employment reported at the time of the first prenatal visit does not appear to be associated with an increase in health-risk behaviors or obstetric complications, but a relationship between working more than 15 hours and small-for-gestational-age delivery was detected.

Adolescent↗
PubMed1994

Health risk behaviors among adolescents who do and do not attend school--United States, 1992.

High proportions of U.S. high school students engage in behaviors that place them at increased risk for the leading causes of death and morbidity (e.g., motor-vehicle crashes and other unintentional injuries, homicide, suicide, heart disease, and cancer), unintended pregnancy, and infection with human immunodeficiency virus (HIV) and other sexually transmitted diseases. Because efforts to measure health-risk behaviors among adolescents throughout the United States have not included those who do not attend school, the prevalences of those behaviors are probably underestimated for the total adolescent population. To characterize more accurately the prevalence of selected health-risk behaviors among adolescents aged 12-19 years who do and do not attend school, CDC analyzed self-reported national data from the Youth Risk Behavior Survey (YRBS), conducted as part of the 1992 National Health Interview Survey (NHIS). This report summarizes the results of the analysis.

Adolescent↗
PubMed1998

HIV-related risk behaviors among psychiatric inpatients in India.

The study explored patterns of risk behavior and knowledge about HIV and AIDS among patients in an inpatient psychiatric facility in south India. Fifty-nine consecutive patients admitted to a state psychiatric hospital were interviewed using a semistructured questionnaire. Fifty-one percent had a history of recent risk behavior, and 86 percent had inadequate knowledge about AIDS. The most common high-risk behavior was unprotected heterosexual intercourse with a high-risk partner. There was no correlation between knowledge and high-risk behavior. The findings underscore the need to specifically tailor intervention programs.

Acquired Immunodeficiency Syndrome↗
PubMedDate not supplied

Health risk behavior of rural low-income expectant fathers.

OBJECTIVE: To assess expectant fathers' health risk behaviors and attitudes about pregnancy-related health issues. Pregnancy may be viewed as a teachable moment: a time when women are receptive to health advice and take action to improve their health and the health of their babies. Pregnancy may also be a teachable moment for expectant fathers, although men's behaviors are rarely considered as part of prenatal care or in associated research. DESIGN: Cross-sectional prevalence study. SAMPLE: Rural low-income expectant fathers (N=138) whose pregnant partners had enrolled in a Medicaid managed care health plan. MEASUREMENT: A telephone survey measuring five health risk behaviors, sociodemographic variables, and pregnancy- and behavior change-related attitudes. RESULTS: Analyses found the following: 49.3% smoked cigarettes; 30.4% engaged in hazardous drinking in the past month; 27.5% had very low physical activity levels; 94.9% had at-risk fruit/vegetable intake; and 42% had weight-related health risk (25.4% met body mass index [BMI] criteria for obesity). Further, 47.9% of the men engaged in three or more of five assessed health risk behaviors. CONCLUSIONS: This sample of expectant fathers engages in high rates of health risk behaviors. Failure to address the health risk behavior of men during prenatal care represents a missed opportunity to improve paternal, maternal, and family health.

Adult↗
PubMed1997

Hostility and increased risk of mortality and acute myocardial infarction: the mediating role of behavioral risk factors.

Cynical hostility has been associated with increased cardiovascular morbidity and mortality; yet few studies have investigated this relation in population-based samples, and little is known about underlying mechanisms. This study examined the association between hostility, measured by the eight-item Cynical Distrust Scale, and risk for all-cause and cardiovascular mortality and incident myocardial infarction. Subjects were 2,125 men, ages 42-60 years, from the Kuopio Ischemic Heart Disease Risk Factor Study, a longitudinal study of unestablished and traditional risk factors for ischemic heart disease, mortality, and other outcomes. There were 177 deaths (73 cardiovascular) in 9 years of follow-up. Men with hostility scores in the top quartile were at more than twice the risk of all-cause mortality (relative hazards (RH) 2.30, 95% confidence interval (CI) 1.47-3.59) and cardiovascular mortality (RH 2.70, 95% CI 1.27-5.76), relative to men with scores in the lowest quartile. Among 1,599 men without previous myocardial infarction or angina, high scorers also had an increased risk of myocardial infarction (RH 2.18, 95% CI 1.01-4.70). Biologic and socioeconomic risk factors, social support, and prevalent diseases had minimal impact on these associations, whereas adjustments for the behavioral risk factors of smoking, alcohol consumption, physical activity, and body mass index substantially weakened the relations. Simultaneous risk factor adjustment eliminated the observed associations. Results show that high levels of hostility are associated with increased risk of all-cause and cause-specific mortality and incident myocardial infarction and that these effects are mediated primarily through behavioral risk factors.

Adult↗
PubMed2000

Behavioral and biologic evidence of persistent high-risk behavior in an HIV primary care population.

OBJECTIVE: To define the prevalence of gonorrhea, chlamydial infection, and high-risk sexual behavior in an HIV primary care clinic. DESIGN: Subjects enrolling in this cross-sectional study answered a brief interviewer-administered questionnaire and provided a urine sample for gonorrhea and chlamydia testing. SETTING: A large urban HIV primary care clinic. PARTICIPANTS: HIV-infected patients presenting for a scheduled medical visit from June 1997 to April 1998. MAIN OUTCOME MEASURES: Prevalence of self-reported high-risk sexual behavior and gonorrhea and chlamydial infection. RESULTS: Of 691 patients consenting to the study over a 10-month period, 58% reported sexual activity in the past 90 days, 7.4% reported multiple sexual partners in the past month, and 34.6% did not use a condom at last sexual encounter. Overall, 4.6% reported a history of either gonorrhea or a chlamydial infection in the past year. Of 637 giving a urine sample for testing, the prevalence of chlamydial infection was 2.4%; the prevalence of gonorrhea was 1.6%. Overall, 7.5% of those screened had either current or recent (within 1 year) gonorrhea or chlamydial infection. Current or recent gonorrhea or chlamydial infection was not associated with age, gender, HIV transmission risk, CD4 cell count, HIV viral load, symptoms, or self-reported risk behavior. CONCLUSION: High-risk sexual behavior and unrecognized sexually transmitted diseases (STD) are common among HIV-infected persons followed in primary medical care. Enhanced detection of treatable STD among this population coupled with improved risk-reduction counselling may be important clinical practice measures that can curb the spread of HIV.

Adult↗
PubMed2005

Changes in HIV risk behaviors among patients receiving combined pharmacological and behavioral interventions for heroin and cocaine dependence.

Cocaine use is associated with injecting and sexual HIV risk behaviors. This study was a randomized controlled trial of behavioral interventions for cocaine dependence and HIV risk behaviors among dually (cocaine and heroin) dependent outpatients. Methadone maintenance was augmented with cognitive-behavioral therapy (CBT), contingency management (CM), both (CBT+CM), or neither. The study sample (n=81) was 52% female, 70% African American, and 37.9+/-7.0 years old. Proportions reporting HIV risk behaviors at intake were: 96.3% (78/81) injection drug use, 56.8% (46/81) sharing needles, 30.9% (25/81) unprotected sex, 28.4% (23/81) trading sex for money or drugs. Proportions who no longer reported behaviors at study exit were: 51.3% (40/78) injection drug use, 91.3% (42/46) sharing needles, 88% (22/25) unprotected sex, 91.3% (21/23) trading sex for money or drugs. Participants receiving CBT+CM were more likely to report cessation of unprotected sex relative to control (OR=5.44, 95% CI 1.14-26.0, p=0.034) but this effect was no longer significant after adjusting for drug-negative urines. These results suggest broad beneficial effects of methadone maintenance augmented with behavioral interventions for reducing HIV risk behaviors.

Adult↗
PubMed1999

Relationship between number of sexual intercourse partners and selected health risk behaviors among public high school adolescents.

PURPOSE: To examine the relationship between number of sexual partners and selected health risk behaviors in a statewide sample of public high school students. METHODS: The Centers for Disease Control and Prevention Youth Risk Behavior Survey was used to secure usable sexual risk-taking, substance use, and violence/aggression data from 3805 respondents. Because simple polychotomous logistic regression analysis revealed a significant Race x Gender interaction, subsequent multivariate models were constructed separately for each race-gender group. Odds ratios and 95% confidence intervals was calculated from polychotomous logistic regression models for number of sexual intercourse partners and their potential risk behavior correlates. RESULTS: An increased number of sexual intercourse partners were correlated with a cluster of risk behaviors that place adolescents at risk for unintended pregnancy, human immunodeficiency virus/acquired immunodeficiency syndrome, and other sexually transmitted infections. For Black females, alcohol, tobacco, marijuana use, and dating violence behaviors were the strongest predictors of an increased number of sexual partners; white females had similar predictors with the addition of physical fighting. For white males, alcohol, tobacco, marijuana use, physical fighting, carrying weapons, and dating violence were the strongest predictors of an increased number of sexual intercourse partners. Black males had similar predictors with the addition of binge alcohol use. CONCLUSION: Prevention of adolescent sexual and other health risk behaviors calls for creative approaches in school and community settings and will require long-term intervention strategies focused on adolescent behavior changes and environmental modifications.

Adolescent↗
PubMed2006

The impact of a situationally focused individual human immunodeficiency virus/sexually transmitted disease risk-reduction intervention on risk behavior in a 1-year cohort of Nigerian military personnel.

Human immunodeficiency virus (HIV) and sexually transmitted disease (STD)-related risks in peacekeeping troops is a concern when they are stationed in areas of high HIV prevalence. We carried out an assessment of a situationally focused individual HIV/STD reduction intervention (where avoidance of risk situations, as well as risk behaviors, are emphasized) in one Nigerian military unit (N = 1,222), with a comparable unit from the same service as a waiting list control (N = 987). The intervention consisted of a possible five modules that were presented to groups of up to 50 personnel. Data were collected on reported sexual behaviors, condom beliefs, sexual risk behaviors with casual partners, and number of interventions attended. Data indicated significant increases in reported condom use with casual partners and positive condom beliefs at 6- and 12-month follow-up. Risk behavior was reduced 30% from baseline at 6 months and 23% from baseline at 12 months. There was also a significant dose-response effect for number of interventions attended. These data suggest that relatively brief situationally focused individual interventions are effective in military and West African contexts in reducing HIV/STD risk behaviors.

Adolescent↗
PubMed2007

Characteristics of sexual abuse in childhood and adolescence influence sexual risk behavior in adulthood.

Childhood and adolescent sexual abuse has been associated with subsequent (adult) sexual risk behavior, but the effects of force and type of sexual abuse on sexual behavior outcomes have been less well-studied. The present study investigated the associations between sexual abuse characteristics and later sexual risk behavior, and explored whether gender of the child/adolescent moderated these relations. Patients attending an STD clinic completed a computerized survey that assessed history of sexual abuse as well as lifetime and current sexual behavior. Participants were considered sexually abused if they reported a sexual experience (1) before age 13 with someone 5 or more years older, (2) between the ages of 13 and 16 with someone 10 or more years older, or (3) before the age of 17 involving force or coercion. Participants who were sexually abused were further categorized based on two abuse characteristics, namely, use of penetration and force. Analyses included 1177 participants (n=534 women; n=643 men). Those who reported sexual abuse involving penetration and/or force reported more adult sexual risk behavior, including the number of lifetime partners and number of previous STD diagnoses, than those who were not sexually abused and those who were abused without force or penetration. There were no significant differences in sexual risk behavior between nonabused participants and those who reported sexual abuse without force and without penetration. Gender of the child/adolescent moderated the association between sexual abuse characteristics and adult sexual risk behavior; for men, sexual abuse with force and penetration was associated with the greatest number of episodes of sex trading, whereas for women, those who were abused with penetration, regardless of whether the abuse involved force, reported the most episodes of sex trading. These findings indicate that more severe sexual abuse is associated with riskier adult sexual behavior.

Adolescent↗
PubMed2002

Two- to sixfold decreased odds of HIV risk behavior associated with use of syringe exchange.

We report results of a community study of syringe exchange that compared the HIV risk behavior of exchange clients with that of nonclients. A prospective cohort of 259 untreated injecting drug users (IDUs) was followed a mean of 10.7 months after baseline. In assessing whether HIV risk behavior at follow-up was associated with study participants' follow-up use of the exchange, we controlled their baseline risk behavior and exchange use as markers of risk-taking tendency in addition to other potential confounders. We also examined whether there was a differential benefit of exchange use for IDUs with versus those without access to other sources of syringes. Both univariate and multivariate analyses revealed a more than twofold decreased odds of HIV risk behavior associated with use of the exchange. In a second multivariate analysis, which examined the interaction of exchange use with access to other sources of syringes, the odds of HIV risk behavior were decreased more than sixfold for IDUs without other sources. We conclude that use of the exchange had a substantial protective effect against HIV risk behavior and may have been especially critical for IDUs without other sources of syringes.

Adolescent↗
PubMed2005

Major mental disorders, substance use disorders, comorbidity, and HIV-AIDS risk behaviors in juvenile detainees.

OBJECTIVES: This study determined the prevalence of 20 HIV-AIDS risk behaviors of four groups of juvenile detainees: those with major mental disorders alone, those with substance use disorders alone, those with comorbid mental and substance use disorders, and those without any major mental or substance use disorder. METHODS: Interviewers administered the AIDS Risk Behavior Assessment to 800 randomly selected juvenile detainees aged ten to 18 years who were initially arrested between 1997 and 1998. Diagnoses were determined with the Diagnostic Interview Schedule for Children, Version 2.3. RESULTS: The sample included 340 females and 460 males. As with the other groups of detainees, youths with major mental disorders had a high prevalence of most HIV-AIDS risk behaviors, much higher than the rates found among youths in the general population. Comorbid substance use disorders substantially increased risk; 96 percent of youths in this group had been sexually active, 62 percent had had multiple partners within the past three months, and 59 percent had had unprotected vaginal sex in the past month. Among youths with a substance use disorder, either alone or with a comorbid major mental disorder, more than 63 percent had engaged in five or more sexual risk behaviors. CONCLUSIONS: Delinquents with substance use disorders, either with or without comorbid major mental disorders, are at particular risk of HIV-AIDS. The juvenile justice and public health systems must provide HIV-AIDS interventions as well as mental health and substance abuse treatment. Greater coordination between community services and correctional facilities can reduce the prevalence of HIV-AIDS risk behaviors of juvenile delinquents and stem the spread of HIV infection among young people.

Acquired Immunodeficiency Syndrome↗