This study examined associations among socioeconomic status (SES), SES-related variables, and sleep in young middle school adolescents. Participants included 155 seventh-graders attending two urban New England middle schools. Aspects of the SES environment included parent demographic variables (e.g., income and education), neighborhood environment, and family home environment. Students complete...

BACKGROUND There is considerable unexplained variation in death rates between deprived areas of Britain. This analysis assesses the degree of variation in socio-demographic factors among deprivation deciles and how variables associated with deaths differ among the most deprived areas. METHODS Death rates 1996-2001, Carstairs' 2001 deprivation score and indicators, population density, black an...

Habitats are composed of multiple variables, each of which may affect one or more population demographic rates. The patterns of correlation among habitat variables can introduce correlations among demographic rates, even if any single habitat variable affects only a single demographic rate and is independent of others. I present a simple model in which habitat is composed of two continuous habi...