Risk Assessment for Carcinogens Under California''s Proposition 65

Risk assessments for carcinogens are being developed through an accelerated process in California as a part of the state's implementation of Proposition 65, the Safe Drinking Water and Toxic Enforcement Act. Estimates of carcinogenic potency made by the California Department of Health Services (CDHS) are generally similar to estimates made by the U.S. Environmental Protection Agency (EPA). The largest differences are due to EPA's use of the maximum likelihood estimate instead of CDHS' use of the upper 95% confidence bounds on potencies derived from human data and to procedures used to correct for studies of short duration or with early mortality. Numerical limits derived from these potency estimates constitute "no significant risk" levels, which govern exemption from Proposition 65's discharge prohibition and warning requirements. Under Proposition 65 regulations, lifetime cancer risks less than 10(-5) are not significant and cumulative intake is not considered. Following these regulations, numerical limits for a number of Proposition 65 carcinogens that are applicable to the control of toxic discharges are less stringent than limits under existing federal water pollution control laws. Thus, existing federal limits will become the Proposition 65 levels for discharge. Chemicals currently not covered by federal and state controls will eventually be subject to discharge limitations under Proposition 65. "No significant risk" levels (expressed in terms of daily intake of carcinogens) also trigger warning requirements under Proposition 65 that are more extensive than existing state or federal requirements. A variety of chemical exposures from multiple sources are identified that exceed Proposition 65's "no significant risk" levels.     

Tests of the causal directions of global — Life facet satisfaction relationships

Previous research generally has supported multiple discrepancies theory (MDT) of the processes by which individuals arrive at judgments of satisfaction with various aspects of their lives as well as with life overall. However, the nature of possible causal relationships between overall and life facet satisfaction has been ignored. The purpose of this study was to extend MDT by testing alternative theoretical models which specified Bottom-up, Top-Down, and Bidirectional relationships between overall life satisfaction and satisfaction with 11 life facets in a sample of 1354 U.S. college students. Results most strongly favored the Bidirectional model in which the overall — life facet satisfaction relationship varied across life domains. The need to identify boundary conditions which determine the direction of the overall — life facet satisfaction relationship is discussed.     

Responding to environmental change in longshoring: Four north American experiences

In longshoring, technological change, expanding competition among ports, and the development of lower cost work forces induced a major restructuring of dock operations. This paper focuses on collective bargaining responses to environmental change and the interplay between those responses, government intervention, the law, and market forces. Four coastal regions in the United States and Canada are studied to gain a broad perspective in two jurisdictions with somewhat differing approaches to government intervention and labor law. Market pressures have become a dominant force, altering the need for and nature of government intervention, and accommodation to change seems most appropriate in today’s highly competitive marketplace. We are indebted to those we interviewed: Brian Ciccozzi, D. P. (Don) Garcia, Terry Lane, Arnold E. Masters, Gene Vrana, Greg Storey, Joe Weiler, and R. V. Wilds. We greatly appreciate the comments of Vitor Marciano, Yoni Reshef, and an anonymous referee, as well as the support of the Social Sciences and Humanities Research Council and the Rice Fellowship. I thank the Oakland University Research Committee for grant support.     

Personality Disorders Among Pathological Gamblers

The objective of this study was to investigate the prevalence of DSM-III-R diagnostic categories of personality disorders in pathological gamblers and to highlight the possible association between such disorders, psychological distress and selected forms of gambling. The Personality Disorders Questionnaire-Revised and a battery of psychometric measures were administered to a sample of 82 consecutive admissions to a behavioral treatment program for gambling problems at an impulse control disorders research unit in Sydney, Australia. Seventy-three percent of subjects were male. The total sample reported having gambled a mean of 15 years of which, on average, the last 6.4 years were associated with problems. Results indicated that the majority of subjects met diagnostic criteria for at least one Personality Disorder (93%), with an average of 4.6 personality disorders per subject. The majority of gamblers evidenced personality disorders from the Cluster B grouping with particularly high rates of borderline, histrionic, and narcissistic personality disorders which were found to be associated with high levels of impulsivity and affective instability. Antisocial personality disorder and narcissistic personality disorder were both found to be possible mediators of the severity of the problem gambling behaviours.     

Problem Gambling Within a Chinese Speaking Community

The purpose of this study was to obtain preliminary data on pathological gambling rates within a metropolitan Chinese community to determine if more costly extensive epidemiological surveys were justified. Two thousand survey questionnaires were distributed to parents through children attending a local Chinese speaking school. A response rate of 27.4% was obtained. Over a quarter of respondents were born overseas in either Mainland China or Hong Kong. Results indicated that gambling was not a popular activity with 60.0% of respondents stating that they never gambled. Of those who gambled, a third of respondents identified lotto as the preferred form. Using a Chinese translation version of the SOGS and a cut-off score of 10, a prevalence estimate of 2.9% for pathological gambling was found with males showing a higher rate (4.3%) as compared to females (1.6%). Respondents reporting a prior history of gambling in their country of origin were more likely to be classified as probable pathological gamblers. Despite the use of a sample of convenience, changes to the wording of two items in the Chinese translation of the SOGS and the possibility of false positive cases in the present study, it is concluded that further research into problem gambling in this community should be undertaken.     

Measuring Knowledge,Attitudes and Behaviours Concerning Sustainable Development among Tenth Grade Students in Manitoba

In this paper we present standardized measures of tenth grade students’ knowledge, attitudes and behaviours concerning sustainable development as those concepts are understood in the United Nations Educational, Scientific and Cultural Organization, and we test the hypothesis that knowledge and favourable attitudes toward SD lead to favourable behaviours. Using a fairly representative random sample of 1,551 tenth grade students from the province of Manitoba, Canada, we crafted 3 indexes. There is a 20-item Index of Knowledge of SD with a good Cronbach alpha = 0.89, a 15-item Index of Attitudes Favourable Toward SD with alpha = 0.84 and a 15-item Index of Behaviours Favourable Toward SD with an alpha = 0.83. About 21% of the variation in our Behaviours Index scores could be accounted for by our Knowledge Index and Attitudes Index scores.     

Good Health is Not the Same as a Good Life: Survey Results from Brandon,Manitoba

The aim of this investigation was to obtain some baseline self-reported data on the health status and overall quality of life of a sample of residents of the city of Brandon, Manitoba aged 18 years or older, and to measure the impact of a set of designated health determinants, comparison standards and satisfaction with diverse domains of life on their health and quality of life. In May and June 2010, 2,500 households from the city of Brandon, Manitoba were randomly selected to receive a mailed out questionnaire and 518 useable, completed questionnaires were returned. Baseline health status data were obtained using the 8 SF-36 dimensions of health and 13 items from the United States Centers for Disease Control and Prevention, Behavioral Risk Factor Surveillance System. Determinants of health and overall quality of life included measures of socializing activities, a Good Neighbourhood Index, Social Support Index, Community Health Index, a measure of free-time exercise levels, health-related behaviours, use of drugs, health care issues, a set of domain-specific quality of life items, a set of measures concerning criminal victimization, worries and behaviours concerning victimization and the basic postulates of Multiple Discrepancies Theory. Overall life assessment, dependent variables included Average Health, happiness, a single item measure of satisfaction with life as a whole, a single item measure of satisfaction with the overall quality of life, the Satisfaction With Life Scale, Contentment with Life Assessment Scale and a Subjective Wellbeing Index. Using multiple regression, we explained as much as 75% of the variance in Subjective Wellbeing scores and as little as 45% in happiness scores. Four clusters of health determinants explained from 20% (Happiness) to 44% (Average Health) of the variance in the dependent variables. Adding comparison standards and domain satisfaction scores to the set of health determinants increased our total explanatory power by only 2% points for Average Health (from 44 to 46%), but more than doubled our explanatory power for Happiness (from 20 to 45%) and for satisfaction with the overall quality of life (from 31 to 67%). As well, our explanatory power for the single item of Life Satisfaction increased from 34 to 66%, for the Satisfaction With Life Scale from 39 to 74%, for the Contentment With Life Assessment Scale from 36 to 60%, and for Subjective Wellbeing from 42 to 75%. This provided very clear evidence that self-perceived good health is not equivalent to perceived quality of life, confirming evidence reported in our earlier studies. The three most important take-home messages from this investigation are (1) in assessing the relative influence of any alleged determinants of health and the quality of life, different sets of alleged determinants will appear to be more or less influential for different dependent variables. Therefore, (2) researchers should use diverse sets of determinants and dependent variables and (3) it is a big mistake to use measures of health status as if they were measures of the perceived quality of life.