The Contribution of Body Mass and Volume of Distribution to the Estimated Uncertainty Associated with the Widmark Equation

The Widmark equation is used forensically for the determination of the amount of ethanol (alcohol) that may have been consumed and also to determine the blood alcohol concentration (BAC) of an individual at a specific time. It is important to be able to estimate the uncertainty associated with Widmark equations. To date, there has been no detailed determination of contribution to the final uncertainty of Widmark calculations of the volume of distribution of ethanol (V_d), using anthropometric equations, or the contribution of an individual’s body mass. Using published data, published literature, and freedom of information data, we determined that the variability (%CV) associated with V_d was ~10% (Watson et al. and Forrest anthropometric equations) and that the %CV associated with estimated body mass was ~15% compared to ~3% when body mass was directly measured. These data allow an estimation of the overall uncertainty of Widmark calculations using general error propagation. The estimated total uncertainty for BAC calculations increased from ~11% (volume consumed) and ~22% (BAC) to ~19% (volume consumed) and ~37% (BAC) when using measured body mass compared to estimated body mass. These results demonstrate that forensic practitioners should be mindful of the increase in estimated uncertainty in calculated Widmark equation results when estimated body mass is used rather than measured body mass. These data further improve the knowledge around the uncertainty of results calculated with the Widmark equation.     

Culturally Distinctive and Academic Socialization: Direct and Interactive Relationships with African American Adolescents’ Academic Adjustment

Theories of ethnic minority development have largely suggested that African American parents engage in a combination of practices that include culturally distinctive socialization as well as behaviors that are characteristic of more universal forms of academic socialization. However, few studies have examined how these socialization dimensions interact to influence the academic adjustment of African American adolescents. The current study explored the independent and interactive roles of parental academic and culturally distinctive socialization on the academic adjustment of African American adolescents. The sample was comprised 144 African American adolescents (M = 12.4; SD = 1.14; 56% female). Findings provided partial support that cultural and academic socialization were independently associated with indicators of academic adjustment. However, the interaction between these dimensions also was associated with youths’ adjustment in the academic domain.     

Does it Matter Who Works at the Center? A Comparative Policy Analysis of Executive Styles

This article develops the concept of executive style to explore how variations in the relationships between politicians, career civil servants, and political appointees affect the types of policy outputs. A comparative analysis of home care policies in New Brunswick and Nova Scotia finds that the former’s civil service executive style – where professional civil servants work in close partnership with politicians in all phases of the policy process – led to the development of an innovative home care program with a long-term vision, whereas the latter’s politicized executive style – where politicians marginalize the role of civil servants in favor of political appointees – led to frequent changes in policy largely driven by short-term considerations.