Estimation of Dietary Exposure to Chemicals: A Case Study Illustrating Methods of Distributional Analyses for Food Consumption Data

There are a number of sources of variability in food consumption patterns and residue levels of a particular chemical (e.g., pesticide, food additive) in commodities that lead to an expected high level of variability in dietary exposures across a population. This paper focuses on examples of consumption pattern survey data for specific commodities, namely that for wine and grape juice, and demonstrates how such data might be analyzed in preparation for performing stochastic analyses of dietary exposure. Data from the NIAAA/NHIS wine consumption survey were subset for gender and age group and, with matched body weight data from the survey database, were used to define empirically-based percentile estimates for wine intake (μl wine/kg body weight) for the strata of interest. The data for these two subpopulations were analyzed to estimate 14-day consumption distributional statistics and distributions for only those days on which wine was consumed. Data subsets for all wine-consuming adults and wine-consuming females ages 18 through 45, were determined to fit a lognormal distribution ( R ²= 0.99 for both datasets). Market share data were incorporated into estimation of chronic exposures to hypothetical chemical residues in imported table wine. As a separate example, treatment of grape juice consumption data for females, ages 18–40, as a simple lognormal distribution resulted in a significant underestimation of intake, and thus exposure, because the actual distribution is a mixture (i.e., multiple subpopulations of grape juice consumers exist in the parent distribution). Thus, deriving dietary intake statistics from food consumption survey data requires careful analysis of the underlying empirical distributions.     

Researching Children: Methods and Ethics

The appropriateness and desirability of researching children have been issues of some debate. Children may be perceived as non-competent or vulnerable, and proxies have been used as children's representatives. Increasingly researchers are speaking to children directly. Why is this so and what are the methodological and ethical implications of researching children's views? In this paper the authors draw on their own experiences of researching children in the fields of child carers and the impact of the Child Support Act 1991. A number of social, political and legal trends are identified which form a background to the growing interest in children as potential and actual participants in the research process. The theoretical, methodological, ethical and practical issues involved are then identified and described, using examples from two separate studies conducted by the authors.     

Live Supervision and Instant Feedback in Marriage and Family Therapy*

In the context of the increasing attention paid to, and increasing demand for training in marital and family therapy, this paper briefly describes several models of supervision and treatment appropriate for use in this field. Advantages and disadvantages of four basic supervision and treatment models are discussed: traditional, co-therapy, direct observation with delayed feedback, and direct observation with instant feedback. The increased options in adopting the latter model are emphasized and a verbatim sample of a case illustrating its use is presented.     

谁会促进你的事业？

你必须分清谁的工作重点与你一致,谁跟你不一致谁会帮助你得到你想要的结果?对每个经理人来说,这都是一个关键问题。要回答这个问题,你必须能够分清谁的工作重点与你相一致,谁跟你不一致。但我们中很少有人使用自己可以支配的工具这样去做。运用同理心进行思考与哈佛商学院教授霍华德·史蒂文森合著《自己敲开机会的门》一书的艾琳·夏皮罗(Eileen Shapiro)称,要确定谁最有可     

MORNING AND NIGHT COUPLES: THE EFFECT OF WAKE AND SLEEP PATTERNS ON MARITAL ADJUSTMENT*

This study explored the effects of spouses' wake and sleep patterns on marital adjustment. A total of 150 couples from three states completed questions on wake/sleep patterns, marital interaction, marital adjustment, and problem solving. Couples whose wake and sleep patterns were mismatched (e.g., an evening person married to a morning person) reported significantly less marital adjustment, more marital conflict, less time spent in serious conversation, less time spent in shared activities and less frequent sexual intercourse than matched couples. Contrary to expectations for matched couples, night couples did not report more involvement in extra-familial social activities than morning couples. Morning couples engaged in sexual intercourse more frequently in the morning than night couples; night couples had sex more often in the evening than morning couples. There were no significant differences in the intercourse rates for morning couples and night couples. Compared to matched couples, mismatched couples with high marital adjustment reported more flexibility and adaptability in their marital problem solving. The implications of these findings for premarital counseling and marital therapy are discussed.