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Sensitivity analysis for unmeasured confounding should be reported more often, especially in observational studies. In the standard Cox proportional hazards model, this requires substantial assumptions and can be computationally difficult. The marginal structural Cox proportional hazards model (Cox proportional hazards MSM) with inverse probability weighting has several advantages compared to the standard Cox model, including situations with only one assessment of exposure (point exposure) and time-independent confounders. We describe how simple computations provide sensitivity for unmeasured confounding in a Cox proportional hazards MSM with point exposure. This is achieved by translating the general framework for sensitivity analysis for MSMs by Robins and colleagues to survival time data. Instead of bias-corrected observations, we correct the hazard rate to adjust for a specified amount of unmeasured confounding. As an additional bonus, the Cox proportional hazards MSM is robust against bias from differential loss to follow-up. As an illustration, the Cox proportional hazards MSM was applied in a reanalysis of the association between smoking and depression in a population-based cohort of Norwegian adults. The association was moderately sensitive for unmeasured confounding.
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PMID:Sensitivity analysis for unmeasured confounding in a marginal structural Cox proportional hazards model. 1910 70

Personality and social support (SS) influence risk for depression and modify its outcome through multiple pathways. The impact of personality dimensions neuroticism and extraversion on SS among patients with major depressive disorder (MDD) has been little studied. In the Vantaa Depression Study, we assessed neuroticism and extraversion with the Eysenck Personality Inventory, objective SS with the Interview Measure of Social Relationships, and subjective SS with the Perceived Social Support Scale-Revised at baseline, at 6 and 18 months among 193 major depressive disorder patients diagnosed according to the fourth edition of Diagnostic and Statistical Manual of Mental Disorders (DMS-IV). At all time-points, low neuroticism and high extraversion associated significantly with between-subject differences in levels of objective and subjective SS. Lower neuroticism (beta = 0.213, p = 0.003) and higher extraversion (beta = 0.159, p = 0.038) predicted greater within-subject change of subjective, but not objective SS. Thus, neuroticism and extraversion associated with the size of objective and subjective SS and predicted change of subjective SS. Modification of subjective SS, particularly, may indirectly influence future vulnerability to depression.
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PMID:Influence of personality on objective and subjective social support among patients with major depressive disorder: a prospective study. 1982

Men who have sex with men experience high rates of psychosocial health problems such as depression, substance use, and victimization that may be in part the result of adverse life experiences related to cultural marginalization and homophobia. These psychosocial health conditions interact to form a syndemic which may be driving HIV risk within this population. However, MSM also evidence great resilience to both the effects of adversity and the effects of syndemics. Investigating and harnessing these natural strengths and resiliencies may enhance HIV prevention and intervention programs thereby providing the additional effectiveness needed to reverse the trends in HIV infection among MSM.
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PMID:Resilience as an untapped resource in behavioral intervention design for gay men. 2134 6

Depression has been shown to be a risk factor for serodiscordant unprotected anal intercourse (SDUAI) in some studies, but not others. Body mass index (BMI) has recently been associated with SDUAI; however, to date, no published study has investigated the interactive effect of depression and BMI on SDUAI. The current study assessed the association between depression, BMI, and SDUAI among HIV-positive MSM. Participants were 430 HIV-positive MSM recruited in a Boston community health center where they received primary care. Participants completed audio computer-assisted self interview (ACASI) measures. Objective height and weight and other clinical variables were accessed through participants' electronic medical records. Depression was positively associated with SDUAI. This association was significantly moderated by BMI. Elevated levels of depression were only associated with SDUAI for underweight participants. These findings suggest that underweight, depressed HIV-positive MSM may be particularly likely to engage in SDUAI.
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PMID:Body mass index, depression and sexual transmission risk behaviors among HIV-positive MSM. 2198 96

Minority adolescents are affected disproportionately by HIV and STIs, and the Internet is a popular venue to meet sex partners. Little is known about the risks of this behavior for minority adolescents. The majority of studies that have examined sexual risk behavior online or STI/HIV prevention programs online have been among adult MSM. In this study, data from 1,045 African American youth found that 6% met sex partners online and in chat rooms. Odds ratios, adjusting for gender, found this behavior was associated with alcohol (AOR = 2.33, 95% CI [1.1, 4.7]) and drug use (AOR = 3.45, 95% CI [1.9, 6.1]), unprotected vaginal (AOR = 4.71, 95% CI [1.9, 8.4]) and anal sex (AOR = 4.77, 95% CI [1.3,17.1]) in the last 90 days, more lifetime vaginal (AOR = 3.65, 95% CI [2.0, 6.8]) and anal sex (AOR = 2.74, 95% CI [1.5, 4.8]), greater sexual sensation seeking (AOR = 2.92, 95% CI [1.5, 5.7]) and greater depression (AOR = 2.06, 95% CI [1.2, 3.6]. A final multiple logistic regression analyses found that male gender (AOR = 3.13, 95% CI [1.7, 5.8]), drug use at last sex (AOR = 2.41, 95% CI [1.3, 4.5]), lifetime history of vaginal (AOR = 2.90, 95% CI [1.5, 5.5]) and anal sex (AOR = 2.09, 95% CI [1.2, 3.6]), and cocaine use (AOR = 8.53, 95% CI [2.7, 27.3]) were independently associated with having sex with a partner met online. Meeting sex partners online is associated with a variety of risks among African American youth; however, the Internet may be an opportunity for intervention.
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PMID:African American adolescents meeting sex partners online: closing the digital research divide in STI/HIV prevention. 2229 79

Mental health problems are highly prevalent among individuals with HIV and are consistently associated with negative health outcomes. However, mental illness often remains untreated due to significant psychosocial and physical barriers to treatment participation. The Collaborative HIV/AIDS Mental Health Program (CHAMP) assessed the outcomes associated with providing 9 months of in-home mental health counseling for 40 individuals with HIV and a Major Axis I mental disorder. The evidence-based Illness Management and Recovery Model was adapted for use with HIV-positive individuals for the study using a community-based participatory research approach. Study participants were surveyed at baseline, 5 and 9 months to assess for changes in health outcomes. Thirty-five percent of study participants were female, 80% African American, 33% self-identified as MSM and the average participant age was 43. Forty percent of participants were on psychotropic medication at baseline. Participants had an average of 8 counseling visits (median 9). Statistically significant decreases in the global Brief Symptom Inventory (BSI) score and a number of BSI symptoms dimensions including anxiety, depression, obsessive compulsive, phobic anxiety and hostility were detected, indicating a reduction of psychiatric symptoms. Statistically significant improvement was also identified for the SF-12 mental health scale, adaptive coping, overall social support and emotional support. No differences in psychiatric outcomes were identified by gender, race/ethnicity, or sexual preference. Findings from the CHAMP Study suggest that the use of in-home mental health treatment may be beneficial in engaging and treating HIV-positive individuals with comorbid mental health disorders.
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PMID:In-home mental health treatment for individuals with HIV. 2305 Jul 67

Among the 50 million people with epilepsy (PWE) worldwide, ~15 to 60% also likely suffer from depression and/or anxiety disorders, and 80% reside in low-income regions where these comorbidities are often underrecognized and undertreated. We developed a 10-item screening tool for the detection of depression and anxiety disorders for use in Zambian primary care clinics where the baseline detection rate of depression and/or anxiety disorders among PWE is ~1%. Consenting adults (n=595) completed the screening tool, and 53.7% screened positive. The screen was validated by a psychiatric clinical officer using DMS-IV criteria. Cronbach's alpha was 0.77 overall and 0.67 and 0.57 for the depression and anxiety components, respectively. Other test characteristics included sensitivity 56.6%, specificity 68.1%, positive predictive value 67.3%, and negative predictive value 57.5%. Interrater reliability (kappa) was 0.85. The psychometric qualities of the tool are inadequate. Development of further, better quality instruments is needed though this will likely require a longer tool which the healthcare workers delivering epilepsy care services have previously deemed nonfeasible for routine use. As we work toward development and acceptability of a more optimal instrument, use of this initial screening tool which healthcare workers are willing to use may increase the identification of comorbid depression and anxiety in the low resource setting described in the study.
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PMID:A primary healthcare screening tool to identify depression and anxiety disorders among people with epilepsy in Zambia. 2351 Jul 42

Depression is highly comorbid with HIV and may contribute to increased sexual transmission risk behavior (TRB) amongst HIV-infected MSM, the largest risk group for HIV in the U.S. However, examinations of this effect are inconsistent. The present longitudinal analyses of 746 HIV-infected MSM is from a multi-site "prevention for positives" study. A non-linear association between depression and TRB emerged. Moderate levels of depression (compared to either low or high levels) were associated with a more modest decline in the odds of sexual risk behavior over 12-month follow-up. Assessing depression in HIV primary care settings may help to identify those at risk and integrating the treatment of depression into secondary prevention and treatment initiatives may decrease the likelihood of sexual risk and help to contain the epidemic among MSM.
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PMID:Moderate levels of depression predict sexual transmission risk in HIV-infected MSM: a longitudinal analysis of data from six sites involved in a "prevention for positives" study. 2360 54

The American Academy of Pediatrics issued its last statement on homosexuality and adolescents in 2004. This technical report reflects the rapidly expanding medical and psychosocial literature about sexual minority youth. Pediatricians should be aware that some youth in their care may have concerns or questions about their sexual orientation or that of siblings, friends, parents, relatives, or others and should provide factual, current, nonjudgmental information in a confidential manner. Although most lesbian, gay, bisexual, transgender, and questioning(LGBTQ) youth are quite resilient and emerge from adolescence as healthy adults, the effects of homophobia and heterosexism can contribute to increased mental health issues for sexual minority youth. LGBTQ and MSM/WSW (men having sex with men and women having sex with women) adolescents, in comparison with heterosexual adolescents,have higher rates of depression and suicidal ideation, high errates of substance abuse, and more risky sexual behaviors. Obtaining a comprehensive, confidential, developmentally appropriate adolescent psychosocial history allows for the discovery of strengths and assets as well as risks. Pediatricians should have offices that are teen-friendly and welcoming to sexual minority youth. This includes having supportive, engaging office staff members who ensure that there are no barriers to care. For transgender youth, pediatricians should provide the opportunity to acknowledge and affirm their feelings of gender dysphoria and desires to transition to the opposite gender. Referral of transgender youth to a qualified mental health professional is critical to assist with the dysphoria, to educate them,and to assess their readiness for transition. With appropriate assistance and care, sexual minority youth should live healthy, productive lives while transitioning through adolescence and young adulthood.
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PMID:Office-based care for lesbian, gay, bisexual, transgender, and questioning youth. 2379 37

We examined the utility of DNA methylation profiles at the CpG island of SLC6A4 (DMS) as a diagnostic biomarker for major depression (MD). In addition, the relationship between DMS and the serotonin transporter gene-linked polymorphic region (5-HTTLPR) allele, the severity of symptoms, number of early adversities, and therapeutic responses to antidepressants were examined. Genomic DNA was extracted from peripheral blood of Japanese healthy controls and patients with MD before and after treatment. DMS was analyzed using a MassARRAY Compact System. The severity of depression was evaluated using the Hamilton Rating Scale for Depression, and early adversity was evaluated using the Early Trauma Inventory. We were unable to distinguish between and healthy controls, or between unmedicated patients and medicated patients using DMS. The 5-HTTLPR allele had no significant effect on DMS. The methylation rates for several CpGs differed significantly after treatment. Notably, the methylation rate of CpG 3 in patients with better therapeutic responses was significantly higher than that in patients with poorer responses. Although further studies examining the function of specific CpG units of SLC6A4 are required, these results suggest that the pre-treatment methylation rate of SLC6A4 is associated with therapeutic responses to antidepressants in unmedicated patients with MD.
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PMID:The potential of SLC6A4 gene methylation analysis for the diagnosis and treatment of major depression. 2465 35


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