Causal assessment of dietary acid load and bone disease: a systematic review & meta-analysis applying Hill's epidemiologic criteria for causality

<p>Abstract</p> <p>Background</p> <p>Modern diets have been suggested to increase systemic acid load and net acid excretion. In response, alkaline diets and products are marketed to avoid or counteract this acid, help the body regulate its pH to prevent and cure disease. The objective of this systematic review was to evaluate causal relationships between dietary acid load and osteoporosis using Hill's criteria.</p> <p>Methods</p> <p>Systematic review and meta-analysis. We systematically searched published literature for randomized intervention trials, prospective cohort studies, and meta-analyses of the acid-ash or acid-base diet hypothesis with bone-related outcomes, in which the diet acid load was altered, or an alkaline diet or alkaline salts were provided, to healthy human adults. Cellular mechanism studies were also systematically examined.</p> <p>Results</p> <p>Fifty-five of 238 studies met the inclusion criteria: 22 randomized interventions, 2 meta-analyses, and 11 prospective observational studies of bone health outcomes including: urine calcium excretion, calcium balance or retention, changes of bone mineral density, or fractures, among healthy adults in which acid and/or alkaline intakes were manipulated or observed through foods or supplements; and 19 <it>in vitro </it>cell studies which examined the hypothesized mechanism. Urine calcium excretion rates were consistent with osteoporosis development; however calcium balance studies did not demonstrate loss of whole body calcium with higher net acid excretion. Several weaknesses regarding the acid-ash hypothesis were uncovered: No intervention studies provided direct evidence of osteoporosis progression (fragility fractures, or bone strength as measured using biopsy). The supporting prospective cohort studies were not controlled regarding important osteoporosis risk factors including: weight loss during follow-up, family history of osteoporosis, baseline bone mineral density, and estrogen status. No study revealed a biologic mechanism functioning at physiological pH. Finally, randomized studies did not provide evidence for an adverse role of phosphate, milk, and grain foods in osteoporosis.</p> <p>Conclusions</p> <p>A causal association between dietary acid load and osteoporotic bone disease is not supported by evidence and there is no evidence that an alkaline diet is protective of bone health.</p

Racial and ethnic disparities in obesity and contributions of social determinants of health among boys with autism spectrum disorder

Children with autism spectrum disorders (ASD) are at greater obesity risk compared to typically developing peers. Although many potential risk factors for this relationship have been identified, the causal chain must be better understood, particularly modifiable social determinants of obesity risk in ASD, and especially for children with ASD from minoritized racial/ethnic groups. We aimed to: (1) examine racial/ethnic disparities in obesity status in boys with ASD; (2) assess associations between social determinants of health and obesity status; and (3) understand if social determinants of health factors mediate the relationship between race/ethnicity and obesity status for these youth. We used data for 124 boys, aged 9–10 with ASD enrolled in an ongoing longitudinal study. Social determinants of health explored included socioeconomic position, Area Deprivation Index, neighborhood safety, food and housing insecurity, and racial/ethnic discrimination. The racial/ethnic distribution was: 17.1% Black, 14.6% Latino, and 68.3% White; average age was 10 years. Both Black (PR 2.57, 95% CI: 1.26–5.26) and Latino boys (PR 2.08, 95% CI: 1.08–4.03) with ASD were more likely to be obese than their White peers. While there were significant differences in some social determinants of health by race/ethnicity, only food insecurity mediated associations between race/ethnicity (Black vs. White) and obesity. The striking disparities in obesity and differences in social determinants of health between Black and Latino children with ASD compared to White children emphasize the need to identify factors that contribute to healthy weight among these children and to address these factors in practice

Secondary and 2-Year Outcomes of a Sexual Assault Resistance Program for University Women

We report the secondary outcomes and longevity of efficacy from a randomized controlled trial that evaluated a novel sexual assault resistance program designed for first-year women university students. Participants (N = 893) were randomly assigned to receive the Enhanced Assess, Acknowledge, Act (EAAA) program or a selection of brochures (control). Perception of personal risk, self-defense self-efficacy, and rape myth acceptance was assessed at baseline; 1-week postintervention; and 6-, 12-, 18-, and 24-month postrandomization. Risk detection was assessed at 1 week, 6 months, and 12 months. Sexual assault experience and knowledge of effective resistance strategies were assessed at all follow-ups. The EAAA program produced significant increases in women’s perception of personal risk, self-defense self-efficacy, and knowledge of effective (forceful verbal and physical) resistance strategies; the program also produced decreases in general rape myth acceptance and woman blaming over the entire 24-month follow-up period. Risk detection was significantly improved for the intervention group at post-test. The program significantly reduced the risk of completed and attempted rape, attempted coercion, and nonconsensual sexual contact over the entire follow-up period, yielding reductions between 30% and 64% at 2 years. The EAAA program produces long-lasting changes in secondary outcomes and in the incidence of sexual assault experienced by women students. Universities can reduce the harm and the negative health consequences that young women experience as a result of campus sexual assault by implementing this program. Online slides for instructors who want to use this article for teaching are available on PWQ’s website at http://journals.sagepub.com/page/pwq/suppl/index

Testing a Model of How a Sexual Assault Resistance Education Program for Women Reduces Sexual Assaults

© The Author(s) 2020. The Enhanced Assess, Acknowledge, Act (EAAA) program has been shown to reduce sexual assaults experienced by university students who identify as women. Prevention researchers emphasize testing theory-based mechanisms once positive outcomes related to effectiveness are established. We assessed the process by which EAAA’s positive outcomes are achieved in a sample of 857 first year university students. EAAA’s goals are to increase risk detection in social interactions, decrease obstacles to risk detection or resistance with known men, and increase women’s use of effective self-defense. We used chained multiple mediator modeling to assess the combined effects of the primary mediators (risk detection, direct resistance, and self-defense self-efficacy) while simultaneously assessing the interrelationships among the secondary mediators (perception of personal risk, belief in the myth of female precipitation, and general rape myth acceptance). The hypothesized multiple mediation model with three primary mediators met the criterion for full mediation of the intervention effects. Together, the mediators accounted for 95% and 76% of the reductions in completed and attempted rape, respectively, demonstrating full mediation. The hypothesized secondary mediators were important in achieving improvements in personal and situational risk detection. The findings strongly support the benefit of cognitive ecological theory and the Assess, Acknowledge, Act conceptualization underlying EAAA. This evidence can be used by administrators and staff responsible for prevention policy and practice on campuses to defend the implementation of theoretically grounded, evidence-based prevention programs

Efficacy of a Sexual Assault Resistance Program for University Women

Background Young women attending university are at substantial risk for being sexually assaulted, primarily by male acquaintances, but effective strategies to reduce this risk remain elusive. Methods We randomly assigned first-year female students at three universities in Canada to the Enhanced Assess, Acknowledge, Act Sexual Assault Resistance program (resistance group) or to a session providing access to brochures on sexual assault, as was common university practice (control group). The resistance program consists of four 3-hour units in which information is provided and skills are taught and practiced, with the goal of being able to assess risk from acquaintances, overcome emotional barriers in acknowledging danger, and engage in effective verbal and physical self-defense. The primary outcome was completed rape, as measured by the Sexual Experiences Survey–Short Form Victimization, during 1 year of follow-up. Results A total of 451 women were assigned to the resistance group and 442 women to the control group. Of the women assigned to the resistance group, 91% attended at least three of the four units. The 1-year risk of completed rape was significantly lower in the resistance group than in the control group (5.2% vs. 9.8%; relative risk reduction, 46.3% [95% confidence interval, 6.8 to 69.1]; P=0.02). The 1-year risk of attempted rape was also significantly lower in the resistance group (3.4% vs. 9.3%, P\u3c0.001). Conclusions A rigorously designed and executed sexual assault resistance program was successful in decreasing the occurrence of rape, attempted rape, and other forms of victimization among first-year university women. (Funded by the Canadian Institutes of Health Research and the University of Windsor; SARE ClinicalTrials.gov number, NCT01338428.

Sexual violence in the lives of first-year university women in Canada: no improvements in the 21st century

Background: Summarizes the frequency, type, and context of sexual assault in a large sample of first-year university women at three Canadian universities. Methods: As part of a randomized controlled trial assessing the efficacy of a sexual assault resistance education program, baseline data were collected from women between ages of 17 and 24 using computerized surveys. Participants’ experience with sexual victimization since the age of 14 years was assessed using the Sexual Experiences Survey–Short Form Victimization (SES-SFV). Results: Among 899 first-year university women (mean age = 18.5 years), 58.7% (95% CI: 55.4%, 62.0%) had experienced one or more forms of victimization since the age of 14 years, 35.0% (95% CI: 31.9%, 38.3%) had experienced at least one completed or attempted rape, and 23.5% (95% CI: 20.7%, 26.4%) had been raped. Among the 211 rape victims, 46.4% (95% CI: 39.7%, 53.2%) had experienced more than one type of assault (oral, vaginal, anal) in a single incident or across multiple incidents. More than three-quarters (79.6%; 95% CI: 74.2%, 85.1%) of the rapes occurred while women were incapacitated by alcohol or drugs. One-third (33.3%) of women had previous self-defence training, but few (4.0%) had previous sexual assault education. Conclusions: Findings from the first large Canadian study of university women since the 1990s indicate that a large proportion of women arrive on campuses with histories of sexual victimization, and they are generally unprepared for the perpetrators they may face during their academic years. There is an urgent need for effective rape prevention programs on university campuses

Sexual assault resistance education for university women: study protocol for a randomized controlled trial (SARE trial)

Background More than one in six women will be sexually assaulted in their lifetimes, most by men they know. The situation on university campuses is even more startling, with as many as 1 in 4 female students being victims of rape or attempted rape. The associated physical and mental health effects are extensive and the social and economic costs are staggering. The aim of this randomized controlled trial is to determine whether a novel, small-group sexual assault resistance education program can reduce the incidence of sexual assault among university-attending women, when compared to current university practice of providing informational brochures. Methods/Design The trial will evaluate a theoretically and empirically sound four-unit, 12-hour education program that has been demonstrated in pilot studies to have short-term efficacy. Three of the four units provide information, skills, and practice aimed at decreasing the time needed for women to assess situations with elevated risk of acquaintance sexual assault as dangerous and to take action, reducing emotional obstacles to taking action, and increasing the use of the most effective methods of verbal and physical self-defense. The fourth unit focuses on facilitating a stronger positive sexuality from which women may resist sexual coercion by male intimates more successfully. The trial will extend the pilot evaluations by expanding the participant pool and examining the long term efficacy of the program. A total of 1716 first-year female students (age 17 to 24 years) from three Canadian universities will be enrolled. The primary outcome is completed sexual assault, measured by The Sexual Experiences Survey - Short Form Victimization instrument. Secondary outcomes include changes in knowledge, attitudes, and skills related to the process of sexual assault resistance. Outcomes will be measured at baseline, 1 week, 6, 12, 18, and 24 months. Discussion The results of the trial will be used to produce a maximally effective sexual assault resistance education program that can be adopted by universities, to assess whether aspects of the program need to be strengthened, and also to indicate how long the effects of the program last and at which point in time refresher sessions may be necessary. Trial registration ClinicalTrials.gov NCT0133842

Cost-benefit of outcome adjudication in nine randomised stroke trials

Background: Central adjudication of outcomes is common for randomised trials and should control for differential misclassification. However, few studies have estimated the cost of the adjudication process.Methods: We estimated the cost of adjudicating the primary outcome in nine randomised stroke trials (25,436 participants). The costs included adjudicators’ time, direct payments to adjudicators, and co-ordinating centre costs (e.g. uploading cranial scans and general set-up costs). The number of events corrected after adjudication was our measure of benefit. We calculated cost per corrected event for each trial and in total.Results: The primary outcome in all nine trials was either stroke or a composite that included stroke. In total, the adjudication process associated with this primary outcome cost in excess of £100,000 for a third of the trials (3/9). Mean cost per event corrected by adjudication was £2295.10 (standard deviation: £1482.42).Conclusions: Central adjudication is a time-consuming and potentially costly process. These costs need to be considered when designing a trial and should be evaluated alongside the potential benefits adjudication brings to determine whether they outweigh this expense

Leptomeningeal disease in oligodendroglial tumors: a population-based study

In this population-based study, we determined the frequency and clinical characteristics of leptomeningeal disease (LMD) developing in the context of oligodendroglial tumors (oligodendrogliomas and oligoastrocytomas). LMD occurred in only 3.9% (8/204) of oligodendroglial tumors and in patients with more recurrences [mean 2.88 vs. 1.27 in LMD and non-LMD, respectively (p = 0.001)]. In contrast to LMD from systemic solid tumors, the median survival following the diagnosis of LMD in oligodendroglial tumors was surprisingly long at 22 months (95% CI 11–33 months). Treatment with oral chemotherapy seemed as effective as more aggressive treatments (e.g. repeat RT or intrathecal chemotherapy) in these patients

Predicting the demand of physician workforce: an international model based on "crowd behaviors"

<p>Abstract</p> <p>Background</p> <p>Appropriateness of physician workforce greatly influences the quality of healthcare. When facing the crisis of physician shortages, the correction of manpower always takes an extended time period, and both the public and health personnel suffer. To calculate an appropriate number of Physician Density (PD) for a specific country, this study was designed to create a PD prediction model, based on health-related data from many countries.</p> <p>Methods</p> <p>Twelve factors that could possibly impact physicians' demand were chosen, and data of these factors from 130 countries (by reviewing 195) were extracted. Multiple stepwise-linear regression was used to derive the PD prediction model, and a split-sample cross-validation procedure was performed to evaluate the generalizability of the results.</p> <p>Results</p> <p>Using data from 130 countries, with the consideration of the correlation between variables, and preventing multi-collinearity, seven out of the 12 predictor variables were selected for entry into the stepwise regression procedure. The final model was: PD = (5.014 - 0.128 × proportion under age 15 years + 0.034 × life expectancy)², with R²of 80.4%. Using the prediction equation, 70 countries had PDs with "negative discrepancy", while 58 had PDs with "positive discrepancy".</p> <p>Conclusion</p> <p>This study provided a regression-based PD model to calculate a "norm" number of PD for a specific country. A large PD discrepancy in a country indicates the needs to examine physician's workloads and their well-being, the effectiveness/efficiency of medical care, the promotion of population health and the team resource management.</p