Estimating heritability for cause specific mortality based on twin studies

There has been considerable interest in studying the magnitude and type of inheritance of specific diseases. This is typically derived from family or twin studies, where the basic idea is to compare the correlation for different pairs that share different amount of genes. We here consider data from the Danish twin registry and discuss how to define heritability for cancer occurrence. The key point is that this should be done taking censoring as well as competing risks due to e.g.  death into account. We describe the dependence between twins on the probability scale and show that various models can be used to achieve sensible estimates of the dependence within monozygotic and dizygotic twin pairs that may vary over time. These dependence measures can subsequently be decomposed into a genetic and environmental component using random effects models. We here present several novel models that in essence describe the association in terms of the concordance probability, i.e., the probability that both twins experience the event, in the competing risks setting. We also discuss how to deal with the left truncation present in the Nordic twin registries, due to sampling only of twin pairs where both twins are alive at the initiation of the registries.     

Job continuity among new mothers

In the early 1990s, both state and federal governments enacted maternity-leave legislation. The key provision of that legislation is that after a leave of a limited duration, the recent mother is guaranteed the right to return to her preleave employer at the same or equivalent position. Using data from the National Longitudinal Survey of Youth, we correlate work status after childbirth with work status before pregnancy to estimate the prevalence, before the legislation, of returns to the preleave employer. Among women working full-time before the pregnancy, return to the prepregnancy employer was quite common. Sixty percent of women who worked full-time before the birth of a child continued to work for the same employer after the child was born. Furthermore, the labor market behavior of most of the remaining 40% suggests that maternity-leave legislation is unlikely to have a major effect on job continuity. Compared with all demographically similar women, however, new mothers have an excess probability of leaving their jobs.     

Ideas, private institutions and American welfare state 'exceptionalism': the case of health and old-age insurance, 1915–1965

Traditional theories of welfare state development divide into two camps: societal accounts and institutional accounts. The aim of the present article is to amend and enrich the institutional approach to US social policy by reconsidering key aspects of the genesis of the American welfare state: 1) showing that concepts such as 'policy feedback' and 'path dependence' need to be extended to encompass the effect of private social policies; and 2) taking policy paradigms and agenda setting more seriously than is the norm in institutional scholarship. The empirical analysis is divided into two parts. The first part explores the activities of the American Association for Labor Legislation (AALL) in the decade beginning in 1910 and the genesis of Social Security in the 1930s, while the second part examines the effect of the private benefit developments on policy choices between 1935 and 1965.     

A Preliminary Investigation of a Telephone Administration of the Quality of Marriage Index

Follow‐up data collection presents many challenges for longitudinal research. Validating paper‐and‐pencil assessments for use via telephone may alleviate these issues. This study evaluates psychometric properties of the Quality of Marriage Index (QMI; Norton, 1983, Journal of Marriage and the Family, 45, 141) when administered by telephone and compares scores with the paper‐and‐pencil version. Participants included women with major depressive disorder and dyadic discord and their male spouses (n = 24 couples). Results suggest excellent scale reliability for the verbal QMI. However, a significant mean difference was found: participants scored on average 3 points higher on the telephone‐administered QMI than on the written QMI. Recommendations for future research and clinical implications are discussed.     

THE QUESTION CUBE: A MODEL FOR DEVELOPING QUESTION REPERTOIRE IN TRAINING COUPLE AND FAMILY THERAPISTS

This paper presents a three-dimensional model for teaching questioning to those wishing to develop skills in couple and family therapy. The model breaks questions into their component parts of format (the style of the question: open, closed, forced choice, rating, or ranking); orientation (the person who is being inquired about: self or other), and subject (the content of the question: behavior, feelings, beliefs, meaning, or relationship). The model is presented in the context of our post-Milan version of couple and family therapy training. The model is useful in that it allows students gradually to increase their repertoire of questions in a way that offers step-wise learning and integrates with their existing skills.