Comparing mortality estimates based on different administrative records

This study investigates how age and race are reported in interviews and on death certificates and how these demographic assignments affect life expectancy estimates for the total population, for males and females, and for blacks and whites. Differential reporting of demographic characteristics can produce different estimated life expectancies and thus differential assessments of the sex and race gaps in life expectancy. This difference underscores the need to define demographic characteristics carefully and to examine multivariate models and projections cautiously.     

Applicability of the WHOQOL-BREF on early adolescence

The WHOQOL-BREF is one of the cross-cultural and widely used measures for assessing health-related quality of life (HRQOL). Previous studies of the HRQOL using the WHOQOL-BREF mainly focused on adult; however, there has been less work carried out on assessing the HRQOL on early adolescence. The goal of this study was to examine the applicability of the WHOQOL-BREF Taiwan version in early adolescent sample. A total of 365 junior high school students participated in this study. Participants completed the WHOQOL-BREF Taiwan version and five visual-analogue items on HRQOL evaluation. The results supported the originally designed four-factor model, and also indicated good item discrimination, internal reliability, factorial validity (by using confirmatory factor analysis) and construct validity (e.g., predictive validity, discriminant and convergent validity) after deleting two physical health items (i.e., “To what extent do you feel that your pain hinders you in doing what you need to do”; “Do you need medical treatment to cope with your daily life?”) and one social relationships item (i.e., “Are you satisfied with your sex life?”). Overall, this study provides the applicability of the WHOQOL-BREF Taiwan version in early adolescence. In addition, the WHOQOL-BREF Taiwan version may be of use to health professionals in the assessment and comparison of different age groups from early adolescence to adulthood.     

Therapeutic Hypothermia: Quantification of the Transition of Core Body Temperature Using the Flexible Mixture Bent‐Cable Model for Longitudinal Data

Hypothermia which is induced by reducing core body temperature is a therapeutic tool used to prevent brain damage resulting from physical trauma. However, all physiological systems begin to slow down due to hypothermia and this can result in increased risk of mortality. Therefore quantification of the transition of core body temperature to early hypothermia is of great clinical interest. Conceptually core body temperature may exhibit an either gradual or abrupt transition. Bent‐cable regression is an appealing statistical tool to model such data due to the model's flexibility and readily interpretable regression coefficients. It handles more flexibly models that traditionally have been handled by low‐order polynomial models (for gradual transition) or piecewise linear changepoint models (for abrupt change). We consider a rat model to quantify the temporal trend of core body temperature primarily to address the question: What is the critical time point associated with a breakdown in the compensatory mechanisms following the start of hypothermia therapy? To this end, we develop a Bayesian modelling framework for bent‐cable regression of longitudinal data to simultaneously account for gradual and abrupt transitions. Our analysis reveals that: (i) about 39% of rats exhibit a gradual transition in core body temperature; (ii) the critical time point is approximately the same regardless of transition type; and (iii) both transition types show a significant increase of core body temperature followed by a significant decrease.     

Does Higher Socioeconomic Status Increase Contact Between Minorities and Whites? An Examination of Interracial Romantic Relationships Among Adolescents*

Objectives. We examine how socioeconomic status of white, black, Hispanic, and Asian adolescents affects their likelihood of dating across racial lines and the racial characteristics of their romantic partners. Methods. We analyze data nationally representative sample of adolescents in 1994–1995 using logistic regression models. Results. Socioeconomic status has little effect on whether adolescents choose an interracial partner except in the case of Hispanics. However, higher socioeconomic status blacks and Asians who interracially date are more likely to have white partners than their SES counterparts. Conclusion. Although social class does not increase the odds of interracial contact, it does increase contact with whites compared to other groups for blacks and Asians.