Longitudinal Assessment of the Relationships Between Geriatric Conditions and Loneliness.

OBJECTIVES: In response to the lack of longitudinal evidence, this study aims to disentangle time sequence and directionality between the severity of geriatric conditions (GCs) and loneliness. DESIGN: Longitudinal panel study. SETTING AND PARTICIPANTS: The working sample had 4680 participants of 2006, 2010, and 2014 waves of the Health and Retirement Study (HRS). All participants were at least 65 years old at baseline. Proxy responded cases and individuals who suffered from moderate to severe cognitive impairment were excluded from the analysis. METHODS: Loneliness was measured with the 3-item UCLA loneliness scale. Five GCs were included: falls, incontinence, vision impairment, hearing impairment, and pain. Severity indicators were the number of times fallen in the past 2 years, number of days experiencing loss of bladder control in the past month, self-rated eyesight, self-rated hearing, and participants' perceived level of pain. RESULTS: Random-intercept cross-lagged panel models were run to analyze the relationship between the severity of each individual GC and loneliness. All models were controlled for baseline demographics, social isolation, self-rated health, physical function, comorbidities, and hospitalization. The longitudinal association between loneliness and fall was bidirectional: a higher loneliness score predicted an increased number of falls and vice versa. Incontinence, vision impairment, hearing impairment, and pain were not significantly associated with loneliness longitudinally. The association between the random intercept of loneliness and some GCs (vision and pain) were significant, indicating the severity of these GCs were related to loneliness at the between-person level at baseline. CONCLUSION AND IMPLICATIONS: Findings of the longitudinal analysis suggest a reciprocal relationship between fall and loneliness. Fall prevention programs could be integrated with social service for addressing loneliness, and alleviating loneliness might be beneficial for preventing falls. Results of this study highlight the importance of integrating clinical management of falls with social services addressing loneliness in long term care.

Disparities in retail marketing for little cigars and cigarillos in Los Angeles, California.

INTRODUCTION: Evidence of a concentration of cigarette advertising in predominantly low-income, non-White neighborhoods underscores the need to examine retail marketing and promotions for novel tobacco products like little cigars and cigarillos (LCCs). We sought to investigate neighborhood racial/ethnic disparities in LCC marketing at retail, including availability, advertising, price promotions, and product placement in Los Angeles, California. METHODS: Between January 2016 and April 2017, community health workers (n = 19) conducted in-person observational audits from tobacco retail stores (n = 679) located in zip codes with a high percentage of non-Hispanic White (n = 196), Black (n = 194), Hispanic/Latino (n = 189), or Korean American (n = 100) residents. To account for clustering effect of zip codes, multilevel modeling approach for a dichotomized outcome was conducted to evaluate the association between racial/ethnic neighborhood sample and dependent variables. RESULTS: Stores located in zip codes with a high percentage of non-Hispanic Blacks had more than eight times higher odds of selling LCCs (OR = 8.10; 95% CI = 3.10-21.11 vs. non-Hispanic White), more than five times higher odds of selling flavored LCCs (OR = 5.20; 95% CI = 2.33-11.61 vs. non-Hispanic White), and more than six times higher odds of displaying storefront exterior LCC signage (OR = 6.03; 95% CI = 2.93-12.40 vs. non-Hispanic White). Stores in Hispanic/Latino and Korean American communities had about three times higher odds of selling LCCs (OR = 3.02; 95% CI = 1.15-7.93 vs. non-Hispanic White; OR = 2.99; 95% CI = 1.33-6.71 vs. non-Hispanic White). CONCLUSIONS: LCCs are heavily marketed in retail establishments in Los Angeles, with disproportionate targeting of predominantly non-White neighborhoods, especially stores in neighborhoods with a higher proportion of African Americans. Local, state, and federal flavor restrictions, minimum pack size standards, preventive messages, and campaigns could counter the influence of LCC marketing in retail establishments.

Associations of Affective Responses During Free-Living Physical Activity and Future Physical Activity Levels: an Ecological Momentary Assessment Study.

PURPOSE: Affective response during physical activity may influence motivation to perform future physical activity behavior. However, affective response during physical activity is often assessed under controlled laboratory conditions. The current study used ecological momentary assessment (EMA) to capture affective responses during free-living physical activity performed by adults, and determined whether these affective responses predict future moderate-to-vigorous physical activity (MVPA) levels after 6 and 12 months. METHOD: At baseline, electronic EMA surveys were randomly prompted across 4 days asking about current activities and affective states (e.g., happy, stressed, energetic, tired). Affective response during physical activity was operationalized as the level of positive or negative affect reported when concurrent physical activity (e.g., exercise or sports) was also reported. Data were available for 82 adults. Future levels of moderate-to-vigorous physical activity (MVPA) were measured using accelerometers, worn for seven consecutive days at 6 and 12 months after the baseline assessment. RESULTS: Feeling more energetic during physical activity was associated with performing more minutes of daily MVPA after both 6 and 12 months. Feeling less negative affect during physical activity was associated with engaging in more daily MVPA minutes after 12 months only. CONCLUSION: This study demonstrated how EMA can be used to capture affective responses during free-living physical activity. Results found that feelings more energetic and less negative during physical activity were associated with more future physical activity, suggesting that positive emotional benefits may reinforce behavior.

Examining acute bi-directional relationships between affect, physical feeling states, and physical activity in free-living situations using electronic ecological momentary assessment.

Current knowledge about the relationship of physical activity with acute affective and physical feeling states is informed largely by lab-based studies, which have limited generalizability to the natural ecology. This study used ecological momentary assessment to assess subjective affective and physical feeling states in free-living settings across 4 days from 110 non-physically active adults (Age M = 40.4, SD = 9.7). Light physical activity (LPA) and moderate-to-vigorous physical activity (MVPA) were measured objectively by an accelerometer. Multilevel modeling was used to test the bi-directional associations between affective and physical feeling states and LPA/MVPA minutes. Higher positive affect, lower negative affect and fatigue were associated with more MVPA over the subsequent 15 min, while higher negative affect and energy were associated with more LPA over the subsequent 15 and 30 min. Additionally, more LPA and MVPA were associated with feeling more energetic over the subsequent 15 and 30 min, and more LPA was additionally associated with feeling more negative and less tired over the subsequent 15 and 30 min. Positive and negative affective states might serve as antecedents to but not consequences of MVPA in adults' daily lives. Changes in LPA may be predicted and followed by negative affective states. Physical feeling states appear to lead up to and follow changes in both LPA and MVPA.

A Rights-Based Sexuality Education Curriculum for Adolescents: 1-Year Outcomes From a Cluster-Randomized Trial.

PURPOSE: The purpose of this study was to evaluate the impact of a rights-based sexuality education curriculum on adolescents' sexual health behaviors and psychosocial outcomes 1 year after participation. METHODS: Within 10 urban high schools, ninth-grade classrooms were randomized to receive a rights-based curriculum or a basic sex education (control) curriculum. The intervention was delivered across two school years (2011-2012, 2012-2013). Surveys were completed by 1,447 students at pretest and 1-year follow-up. Multilevel analyses examined curriculum effects on behavioral and psychosocial outcomes, including four primary outcomes: pregnancy risk, sexually transmitted infection risk, multiple sexual partners, and use of sexual health services. RESULTS: Students receiving the rights-based curriculum had higher scores than control curriculum students on six of nine psychosocial outcomes, including sexual health knowledge, attitudes about relationship rights, partner communication, protection self-efficacy, access to health information, and awareness of sexual health services. These students also were more likely to report use of sexual health services (odds ratio, 1.37; 95% confidence interval, 1.05-1.78) and more likely to be carrying a condom (odds ratio, 1.97; 95% confidence interval, 1.39-2.80) relative to those receiving the control curriculum. No effects were found for other sexual health behaviors, possibly because of low prevalence of sexual activity in the sample. CONCLUSIONS: The curriculum had significant, positive effects on psychosocial and some behavioral outcomes 1 year later, but it might not be sufficient to change future sexual behaviors among younger adolescents, most of whom are not yet sexually active. Booster education sessions might be required throughout adolescence as youth initiate sexual relationships.

A Longitudinal Analysis of the Effects of Socioeconomic Factors, Foreign Media, and Attitude toward Appearance on General and Central Adiposity in Chinese Adolescents.

OBJECTIVE: This paper explores the longitudinal effects of socioeconomic factors (i.e., parent education and family income level), foreign media, and attitude toward appearance on general and central adiposity among Chinese adolescents. METHOD: A longitudinal analysis was performed using data from the China Seven Cities Study, a health promotion and smoking prevention study conducted in seven cities across Mainland China between 2002 and 2005. Participants included 5,020 middle and high school students and their parents. Explanatory variables included foreign media exposure, attitude toward appearance, parent education, and family income. Three-level, random-effect models were used to predict general adiposity (i.e., body mass index) and central adiposity (i.e., waist circumference). The Generalized Estimating Equation approach was utilized to determine the effect of explanatory variables on overweight status. RESULTS: Among girls, foreign media exposure was significantly negatively associated with general adiposity over time (ß=-0.06, p=0.01 for middle school girls; ß=-0.06, p=0.03 for high school girls). Attitude toward appearance was associated with lesser odds of being overweight, particularly among high school girls (OR=0.86, p<0.01). Among boys, parental education was significantly positively associated with general adiposity (ß=0.62, p<0.01 for middle school boys; ß=0.37, p=0.02 for high school boys) and associated with greater odds of being overweight (OR=1.55, p<0.01 for middle school boys; OR=1.26, p=0.04 for high school boys). Across all gender and grade levels, family income was significantly negatively associated with central adiposity over time. CONCLUSION: Interventions addressing Chinese adolescent overweight/obesity should consider these factors as potential focus areas.

Short-term effects of a rights-based sexuality education curriculum for high-school students: a cluster-randomized trial.

BACKGROUND: An emerging model for sexuality education is the rights-based approach, which unifies discussions of sexuality, gender norms, and sexual rights to promote the healthy sexual development of adolescents. A rigorous evaluation of a rights-based intervention for a broad population of adolescents in the U.S. has not previously been published. This paper evaluates the immediate effects of the Sexuality Education Initiative (SEI) on hypothesized psychosocial determinants of sexual behavior. METHODS: A cluster-randomized trial was conducted with ninth-grade students at 10 high schools in Los Angeles. Classrooms at each school were randomized to receive either a rights-based curriculum or basic sex education (control) curriculum. Surveys were completed by 1,750 students (N = 934 intervention, N = 816 control) at pretest and immediate posttest. Multilevel regression models examined the short-term effects of the intervention on nine psychosocial outcomes, which were hypothesized to be mediators of students' sexual behaviors. RESULTS: Compared with students who received the control curriculum, students receiving the rights-based curriculum demonstrated significantly greater knowledge about sexual health and sexual health services, more positive attitudes about sexual relationship rights, greater communication about sex and relationships with parents, and greater self-efficacy to manage risky situations at immediate posttest. There were no significant differences between the two groups for two outcomes, communication with sexual partners and intentions to use condoms. CONCLUSIONS: Participation in the rights-based classroom curriculum resulted in positive, statistically significant effects on seven of nine psychosocial outcomes, relative to a basic sex education curriculum. Longer-term effects on students' sexual behaviors will be tested in subsequent analyses. TRIAL REGISTRATION: ClinicalTrials.gov NCT02009046.

Integrating spatial technology into studying the generational differences of migrants' health protection status in urban China.

OBJECTIVES: The objectives of this study were to investigate differences on health protection status between two generations (born pre- vs. post- 1980) of rural-to-urban migrants in China, and whether the differences are associated with spatial contexts. METHODS: Respondent-Driven Sampling (RDS) approach was used to recruit migrants in Chengdu city from September 2008 to July 2009. All migrants' residences were geo-coded on the map. Hepatitis B Vaccination serves as a surrogate for the Health protection status. Logistic regression was used to explore the association between independent variables and the Hepatitis B vaccination status. Spatial scan statistics were used to explore the spatial pattern of the Hepatitis B vaccination status. RESULTS: Among the 1045 rural-to-urban migrants, higher education, better employment condition and post-80 generation are positively associated with the Hepatitis B vaccination status, while marriage status, the insurance status and the income are not. The spatial scan statistics identified three spatial clusters of low vaccination rate. Two of them were in urban villages and the other was a declining workers' community. CONCLUSIONS: The migrant population is heterogeneous, and the post-80 generation migrants get more health protection. Spatial analytical techniques illustrated clusters of low vaccination rate are highly linked with pre-1980 generation migrants and other socioeconomic factors, especially the employment condition. Such information might shed light on the differences and needs across migrant subgroups and may be useful for developing more targeted health policies for Chinese migrants.

Technology-facilitated depression care management among predominantly Latino diabetes patients within a public safety net care system: comparative effectiveness trial design.

Health disparities in minority populations are well recognized. Hispanics and Latinos constitute the largest ethnic minority group in the United States; a significant proportion receives their care via a safety net. The prevalence of diabetes mellitus and comorbid depression is high among this group, but the uptake of evidence-based collaborative depression care management has been suboptimal. The study design and baseline characteristics of the enrolled sample in the Diabetes-Depression Care-management Adoption Trial (DCAT) establishes a quasi-experimental comparative effectiveness research clinical trial aimed at accelerating the adoption of collaborative depression care in safety net clinics. The study was conducted in collaboration with the Los Angeles County Department of Health Services at eight county-operated clinics. DCAT has enrolled 1406 low-income, predominantly Hispanic/Latino patients with diabetes to test a translational model of depression care management. This three-group study compares usual care with a collaborative care team support model and a technology-facilitated depression care model that provides automated telephonic depression screening and monitoring tailored to patient conditions and preferences. Call results are integrated into a diabetes disease management registry that delivers provider notifications, generates tasks, and issues critical alerts. All subjects receive comprehensive assessments at baseline, 6, 12, and 18 months by independent English-Spanish bilingual interviewers. Study outcomes include depression outcomes, treatment adherence, satisfaction, acceptance of assessment and monitoring technology, social and economic stress reduction, diabetes self-care management, health care utilization, and care management model cost and cost-effectiveness comparisons. DCAT's goal is to optimize depression screening, treatment, follow-up, outcomes, and cost savings to reduce health disparities.

Bullying victimization as a mediator of associations between cultural/familial variables, substance use, and depressive symptoms among Hispanic youth.

OBJECTIVES: This article examines the antecedents and consequences of bullying victimization among a sample of Hispanic high school students. Although cultural and familial variables have been examined as potential risk or protective factors for substance use and depression, previous studies have not examined the role of peer victimization in these processes. We evaluated a conceptual model in which cultural and familial factors influenced the risk of victimization, which in turn influenced the risk of substance use and depression. DESIGN: Data were collected as part of a longitudinal survey study of 9th and 10th grade Hispanic/Latino students in Southern California (n = 1167). The student bodies were at least 70% Hispanic/Latino with a range of socioeconomic characteristics represented. We used linear and logistic regression models to test hypothesized relationships between cultural and familial factors and depression and substance use. We used a mediational model to assess whether bullying victimization mediated these associations. RESULTS: Acculturative stress and family cohesion were significantly associated with bullying victimization. Family cohesion was associate d with depression and substance use. Social support was associated with alcohol use. Acculturative stress was associated with higher depression. The associations between acculturative stress and depression, family cohesion and depression, and family cohesion and cigarette use were mediated by bullying victimization. CONCLUSION: These findings provide valuable information to the growing, but still limited, literature about the cultural barriers and strengths that are intrinsic to the transition from adolescence to emerging adulthood among Hispanic youth. Our findings are consistent with a mediational model in which cultural/familial factors influence the risk of peer victimization, which in turn influences depressive symptoms and smoking, suggesting the potential positive benefits of school-based programs that facilitate the development of coping skills for students experiencing cultural and familial stressors.

Changes in developmental contexts as predictors of transitions in HIV-risk behaviors among young men who have sex with men (YMSM).

Emerging adulthood is a transitional time often marked by instability in many areas of life, including residential status, work, school, and romantic relationships. The purpose of this study is to examine transitions in HIV-risk related behaviors among a cohort of ethnically-diverse young men who have sex with men (YMSM) and to reveal how changes in developmental contexts during emerging adulthood might be associated with these behavioral changes. Hidden Markov models were used to examine movement across different stages of behavioral risk-taking over time. Semi-annual surveys were administered across 2 years; analyses included those with at least three of the five waves of data. Results indicated substantial movement at the individual-level transitions. Additionally, high variability in sexual risk, alcohol misuse, and illicit drug-risk behaviors was predicted by age, ethnicity, and correlates of emerging adulthood, such as residential status, work, post-secondary school enrollment, and primary-relationship status. Findings provide evidence of great change in risky behaviors among YMSM during this pivotal time, particularly among those who actively experiment in varying levels of risk-taking. In order to prevent experimental behaviors from evolving into more serious risk, interventions must consider ways to assist YMSM to adjust to life changes brought on by emerging adulthood.

Effectiveness of a lifestyle intervention in promoting the well-being of independently living older people: results of the Well Elderly 2 Randomised Controlled Trial.

BACKGROUND: Older people are at risk for health decline and loss of independence. Lifestyle interventions offer potential for reducing such negative outcomes. The aim of this study was to determine the effectiveness and cost-effectiveness of a preventive lifestyle-based occupational therapy intervention, administered in a variety of community-based sites, in improving mental and physical well-being and cognitive functioning in ethnically diverse older people. METHODS: A randomised controlled trial was conducted comparing an occupational therapy intervention and a no-treatment control condition over a 6-month experimental phase. Participants included 460 men and women aged 60-95 years (mean age 74.9 ± 7.7 years; 53% <$12000 annual income) recruited from 21 sites in the greater Los Angeles metropolitan area. RESULTS: Intervention participants, relative to untreated controls, showed more favourable change scores on indices of bodily pain, vitality, social functioning, mental health, composite mental functioning, life satisfaction and depressive symptomatology (ps<0.05). The intervention group had a significantly greater increment in quality-adjusted life years (p<0.02), which was achieved cost-effectively (US $41218/UK £24868 per unit). No intervention effect was found for cognitive functioning outcome measures. CONCLUSIONS: A lifestyle-oriented occupational therapy intervention has beneficial effects for ethnically diverse older people recruited from a wide array of community settings. Because the intervention is cost-effective and is applicable on a wide-scale basis, it has the potential to help reduce health decline and promote well-being in older people. Trial Registration clinicaltrials.gov identifier: NCT0078634.

One-year postcollaborative depression care trial outcomes among predominantly Hispanic diabetes safety net patients.

OBJECTIVE: The aim of this study was to determine sustained effectiveness in reducing depression symptoms and improving depression care 1 year following intervention completion. METHOD: Of 387 low-income, predominantly Hispanic diabetes patients with major depression symptoms randomized to 12-month socioculturally adapted collaborative care (psychotherapy and/or antidepressants, telephone symptom monitoring/relapse prevention) or enhanced usual care, 264 patients completed 2-year follow-up. Depression symptoms (Symptom Checklist-20 [SCL-20], Patient Health Questionnaire-9 [PHQ-9]), treatment receipt, diabetes symptoms and quality of life were assessed 24 months postenrollment using intent-to-treat analyses. RESULTS: At 24 months, more intervention patients received ongoing antidepressant treatment (38% vs. 25%, χ(2)=5.11, df=1, P=.02); sustained depression symptom improvement [SCL-20 <0.5 (adjusted odds ratio=2.06, 95% confidence interval=1.09-3.90, P=.03), SCL-20 score (adjusted mean difference -0.22, P=.001) and PHQ-9 ≥50% reduction (adjusted odds ratio=1.87, 95% confidence interval =1.05-3.32, P=.03)]. Over 2 years, improved effects were found in significant study group by time interaction for Short Form-12 mental health, Sheehan Disability Scale (SDS) functional impairment, diabetes symptoms, anxiety and socioeconomic stressors (P=.02 for SDS; P<.0001 for all others); however, group differences narrowed over time and were no longer significant at 24 months. CONCLUSIONS: Socioculturally tailored collaborative care that included maintenance antidepressant medication, ongoing symptom monitoring and behavioral activation relapse prevention was associated with depression improvement over 24 months for predominantly Hispanic patients in primary safety net care.

Influences of social support, perceived barriers, and negative meanings of physical activity on physical activity in middle school students.

BACKGROUND: A profound decline in physical activity occurs in puberty. This phenomenon is not well understood. Therefore, the purpose of this study is to examine associations between family/friend social support for physical activity, negative meanings of physical activity (NMPA), and internal /external barriers to physical activity with moderate to vigorous physical activity (MVPA), and sedentary and light behavior (SLB) in youth. METHODS: A total of 350 participants from 7 Los Angeles County middle schools participated in the study (62% Latina, 79% females). Hypothesized pathways were examined using structural equation modeling. Psychosocial variables and participation in MVPA and SLB were assessed by self-reported questionnaires. RESULTS: NMPA were related to lower levels of family/friend social support and greater internal/external barriers. Family social support was the only significant indicator of MVPA (ß=0.79). Low family social support was related to higher SLB (ß=-0.25). CONCLUSIONS: Family social support seems crucial to promote MVPA and reduce SLB in adolescents and might be influenced by child's feelings about physical activity. Future research should consider the interrelationship between psychosocial correlates of physical activity.

One-year follow-up of collaborative depression care for low-income, predominantly Hispanic patients with cancer.

OBJECTIVE: This study assessed longer-term outcomes of low-income patients with cancer (predominantly female and Hispanic) after treatment in a collaborative model of depression care or in enhanced usual care. METHODS: The randomized controlled trial, conducted in safety-net oncology clinics, recruited 472 patients with major depression symptoms. Patients randomly assigned to a 12-month intervention (a depression care manager and psychiatrist provided problem-solving therapy, antidepressants, and symptom monitoring and relapse prevention) or enhanced usual care (control group) were interviewed at 18 and 24 months after enrollment. RESULTS: At 24 months, 46% of patients in the intervention group and 32% in the control group had a ≥50% decrease in depression score over baseline (odds ratio=2.09, 95% confidence interval=1.13-3.86; p=.02); intervention patients had significantly better social (p=.03) and functional (p=.01) well-being. Treatment receipt among intervention patients declined (72%, 21%, and 18% at 12, 18, and 24 months, respectively); few control group patients reported treatment receipt (10%, 6%, and 13%, respectively). Significant differences in receipt of counseling or antidepressants disappeared at 24 months. Depression recurrence was similar between groups (intervention, 36%; control, 39%). Among patients with depression recurrence, intervention patients were more likely to receive treatment after 12 months (34% versus 10%; p=.03). At 24 months, attrition (262 patients, 56%) did not vary by group; 22% were deceased, 20% declined further participation, and 14% could not be located. CONCLUSIONS: Collaborative care reduced depression symptoms and enhanced quality of life; however, results call for ongoing depression symptom monitoring and treatment for low-income cancer survivors.

The perceived consequences of safer injection: an exploration of qualitative findings and gender differences.

Injection drug users (IDUs) are at a risk for HIV and other bloodborne pathogens via syringe and paraphernalia sharing, with females being at elevated risk. Consequences of injection risk behavior such as the risk of becoming infected with HIV have been relatively well studied, though less is known about the consequences of refusing to share injection equipment. We conducted indepth qualitative interviews with 26 IDUs recruited from a syringe exchange program in Los Angeles, California, USA, to understand the consequences of refusing to share injection equipment and to determine whether these perceived consequences differ by gender. Perceived consequences were organized into four domains using a social ecological framework: microsystem (perceived risk for HIV, drug withdrawal or forgoing drug use), exosystem (trust and social norms), mesosystem (precarious housing and shelter policies), and macrosystem (syringe access/inconvenience, economic and legal consequences). Gender differences were identified in some, but not in all areas. Effective public health interventions among IDUs will benefit from a holistic perspective that considers the environmental and social rationality (Kowalewski, M., Henson, K.D., & Longshore, D. (1997). Rethinking perceived risk and health behavior: A critical review of HIV prevention research. Health Education and Behavior, 24(3), 313-325) of decisions regarding injection risk behavior and assists individuals in addressing the consequences that they perceive to be the most salient.

Reasons for urban trail use predict levels of trail-related physical activity.

BACKGROUND: Efforts to increase community levels of physical activity through the development of multiuse urban trails could be strengthened by information about factors predicting trail use. This study examined whether reasons for trail use predict levels of physical activity on urban trails. METHODS: Adults (N = 335) living within a 1-mile buffer zone of urban trails in Chicago, Dallas, and Los Angeles completed a self-report measure assessing demographics, reason for trail use, and physical activity on the trail. Accelerometers measured total daily moderate-to-vigorous physical activity (MVPA). Environmental features of the urban trail were assessed with the Systematic Pedestrian and Cyclist Environmental Scan for trails measure. Multivariate regression analyses were conducted that accounted for clustering of individuals within trail segments. RESULTS: After controlling for demographic and environmental factors and total daily MVPA, reasons for trail use significantly predicted recreational but not transportation activity. Recreational trail activity was greater for participants who reported exercise and health reasons for trail use as compared with other reasons (ie, social interaction, enjoying nature, walking pets) for recreational trail use. CONCLUSIONS: To increase the use of urban trails, it may be useful to promote the health and exercise benefits of recreational trail use.

Confronting challenges in intervention research with ethnically diverse older adults: the USC Well Elderly II Trial.

BACKGROUND: Community-dwelling older adults are at risk for declines in physical health, cognition, and psychosocial well-being. However, their enactment of active and health-promoting lifestyles can reduce such declines. PURPOSE: The purpose of this article is to describe the USC Well Elderly II study, a randomized clinical trial designed to test the effectiveness of a healthy lifestyle program for elders, and document how various methodological challenges were addressed during the course of the trial. METHODS: In the study, 460 ethnically diverse elders recruited from a variety of sites in the urban Los Angeles area were enrolled in a randomized experiment involving a crossover design component. Within either the first or second 6-month phase of their study involvement, each elder received a lifestyle intervention designed to improve a variety of aging outcomes. At 4-5 time points over an 18-24 month interval, the research participants were assessed on measures of healthy activity, coping, social support, perceived control, stress-related biomarkers, perceived physical health, psychosocial well-being, and cognitive functioning to test the effectiveness of the intervention and document the process mechanisms responsible for its effects. RESULTS: The study protocol was successfully implemented, including the enrollment of study sites, the recruitment of 460 older adults, administration of the intervention, adherence to the plan for assessment, and establishment of a large computerized data base. LIMITATIONS: Methodological challenges were encountered in the areas of site recruitment, participant recruitment, testing, and intervention delivery. CONCLUSIONS: The completion of clinical trials involving elders from numerous local sites requires careful oversight and anticipation of threats to the study design that stem from: (a) social situations that are particular to specific study sites; and (b) physical, functional, and social challenges pertaining to the elder population.

Socio-demographic and economic correlates of overweight status in Chinese adolescents.

OBJECTIVE: To investigate over-weight prevalence and socio-demographic and economic correlates in Chinese adolescents. METHODS: Weight, height, waist circumference, and socio-demo-graphic and economic variables of 6863 middle and high school students were measured. RESULTS: 10% of girls and 17% of boys were overweight. Waist circumference and overweight risk were significantly associated with pubertal status (P<0.05). High levels of parental education and family income were significant risk factors for overweight (P<0.05). DISCUSSION: Our findings underscore the need for development of evidence-based and culturally appropriate public health programs to prevent and treat pediatric obesity in China.

Influences affecting adolescent smoking behavior in China.

This study examined multiple influences on the use of tobacco by adolescents in China. Using the theory of triadic influences as a guide, we selected interpersonal, attitudinal/cultural, and intrapersonal constructs from baseline data to predict adolescent smoking 1 year later. We used prospective data from middle and high school students (N = 11,583) and their parents from the China Seven Cities Study, a longitudinal study that is evaluating the effects of changing economic and social factors on health behaviors including tobacco use. A multilevel regression analysis provided some support that each of the influences in the theory of triadic influences affects adolescent smoking in China. After adjusting for important confounders including age, gender, socioeconomic status, and smoking behaviors (lifetime and past 30-day) at baseline, we found significant risk factors within each of the three categories, including interpersonal influences (parental monitoring, good friend smoking, and peer smoking), attitudinal/cultural influences (school academic ranking, initial liking of smoking, and the meaning of smoking), and intrapersonal influences (susceptibility to smoking, and low self-confidence to quit smoking). Results suggest that the etiology of smoking among adolescents in China might be similar to that observed in western countries and that some of the techniques used successfully in prevention programs in those countries might be useful guides when developing prevention programs in China.