Physical Activity Behaviors of Students of a Rural Historically Black College

Abstract

Physical activity can have a positive impact on health disparities among African Americans. Objective: In this study, we assessed physical activity behaviors and correlates of students of a Historically Black College. Methods: In September 2004, an online survey and pedometers were used to measure physical activity behavior and correlates. Participants: A convenience sample of 106 students completed the survey and received pedometers. Pedometer data were submitted online for 5 weeks. Results: One hundred and six students completed the survey. Twenty-eight percent and 41% of respondents met recommendations for moderate physical activity and vigorous physical activity, respectively. Week 1 daily pedometer step count average was 8,707. Most students reported positive outcome expectations for physical activity. Students submitting pedometer data were less likely to meet MPA recommendations than students only completing the survey. Conclusions: African American students feel positive about physical activity yet most do not meet recommended levels.     

Associations between gambling,substance misuse and recidivism among Canadian offenders: a multifaceted exploration of poor impulse control traits and behaviours

Moderate correlations among gambling, substance use and crime suggest these three behaviours may each be indicators of a single underlying problem trait, such as poor impulse control. We tested whether self-reported traits prospectively predicted future criminal recidivism, when accounting for incarcerated adult offenders' past criminal behaviour, substance use and gambling behaviour. We took a multi-construct approach to measuring components of impulse control, utilizing three questionnaires that assess sensation seeking, poor premeditation, and reward sensitivity. Male participants incarcerated in two federal institutions were invited to complete self-report booklets; participation was self-selected and fully voluntary. Results indicated moderate correlations between measures of trait impulse control, self-reported drug use, and official criminal history (N = 140). Gambling problems prospectively predicted post-release criminal recidivism (n = 83), even when accounting for past criminal behaviour, impulse control traits and substance misuse. Although they represent a small percentage of this sample, results suggest offenders with high gambling problems represent a particularly at-risk group for future crime, who were more than four times likely to reoffend compared to offenders without problem gambling. These results suggest there may be mutual impact of problem behaviours on life outcomes above the contribution of poor impulse control.     

Two? Two and One-Half? Thirty Months? Chronometrical Childhood in Early Twentieth Century America

Child-rearing books and manuals from the early twentieth century indicate that pediatricians and developmental psychologists were prone to divide the life course of children into increasingly precise chronometrical stages, e.g., focusing on changes from one month to the next rather than one year to another. Little is known, however, of whether parents also chronometricalized their children's lives. Working with 206 advice-seeking letters written by fathers and mothers in the 1920s and 1930s to nationally known educator and author Angelo Patri (1876–1965), we develop a text-based measure of chronometrical childhood, employ it in a multivariate analysis, and find that an urban environment heightened parents' tendencies toward chronometricity, while the financial strain of the Great Depression did just the opposite. Our results show how age can be viewed as a social construction, subject to the influence of ideology and economics, and that the scheduling of children's lives can vary in different locales and at different historical moments.     

Percentiles of the Product of Uncertainty Factors for Establishing Probabilistic Reference Doses

Exposure guidelines for potentially toxic substances are often based on a reference dose (RfD) that is determined by dividing a no-observed-adverse-effect-level (NOAEL), lowest-observed-adverse-effect-level (LOAEL), or benchmark dose (BD) corresponding to a low level of risk, by a product of uncertainty factors. The uncertainty factors for animal to human extrapolation, variable sensitivities among humans, extrapolation from measured subchronic effects to unknown results for chronic exposures, and extrapolation from a LOAEL to a NOAEL can be thought of as random variables that vary from chemical to chemical. Selected databases are examined that provide distributions across chemicals of inter- and intraspecies effects, ratios of LOAELs to NOAELs, and differences in acute and chronic effects, to illustrate the determination of percentiles for uncertainty factors. The distributions of uncertainty factors tend to be approximately lognormally distributed. The logarithm of the product of independent uncertainty factors is approximately distributed as the sum of normally distributed variables, making it possible to estimate percentiles for the product. Hence, the size of the products of uncertainty factors can be selected to provide adequate safety for a large percentage (e.g., approximately 95%) of RfDs. For the databases used to describe the distributions of uncertainty factors, using values of 10 appear to be reasonable and conservative. For the databases examined the following simple "Rule of 3s" is suggested that exceeds the estimated 95th percentile of the product of uncertainty factors: If only a single uncertainty factor is required use 33, for any two uncertainty factors use 3 x 33 approximately 100, for any three uncertainty factors use a combined factor of 3 x 100 = 300, and if all four uncertainty factors are needed use a total factor of 3 x 300 = 900. If near the 99th percentile is desired use another factor of 3. An additional factor may be needed for inadequate data or a modifying factor for other uncertainties (e.g., different routes of exposure) not covered above.     

Differential mortality of Asians and Pacific Islanders in The Pacific Labour Trade

Quantitative evidence is presented on the differential mortality suffered by Indian and Pacific Island labour migrants on Fiji’s plantations between 1883 and 1919, and by Japanese, Chinese and Pacific Island labour migrants in the phosphate mines on Ocean Island and Nauru between 1913 and 1940. Pacific Island labour migrants suffered much higher death rates than Asian labour migrants, due, it is suggested, to their much greater vulnerability to newly introduced infectious diseases. This paper was generated by an ongoing project supported by the Australian Research Grants Scheme. I am indebted to Maie Raud for excellent research assistance, to Doug Munro for stimulating my interest in Ocean Island and Nauru while on a Visiting Research Fellowship at The Flinders University of South Australia, to Bryan Gandevia and Barry Smith for a most helpful correspondence on disease in history, and to Stanley L. Engerman, Brij V. Lal, Barrie Macdonald, Doug Munro, Jonathan J. Pincus, Leonie Randall, Barry Smith, Richard H. Steckel and two anonymous referees for comments on an earlier version of this paper.     

Evaluation of Developmental Toxicity Data: A Discussion of Some Pertinent Factors and a Proposal

There is currently no well-accepted standard method for evaluation of developmental toxicity data. This paper presents one approach to the evaluation of developmental toxicity data. We initially identify some pertinent factors that influence the interpretation of animal data and summarize the literature pertaining to these factors. Such factors include the quality and quantity of data and the relationship between maternal and developmental toxicity. We proceed with a discussion of quantitative assessment of data and propose schemes for qualitative and quantitative developmental hazard assessments.