OBJECTIVE To develop and validate a general method (called regression risk analysis) to estimate adjusted risk measures from logistic and other nonlinear multiple regression models. We show how to estimate standard errors for these estimates. These measures could supplant various approximations (e.g., adjusted odds ratio [AOR]) that may diverge, especially when outcomes are common. STUDY DESI...

Abstract: The governing equations of motion for a drill string considering coupling between axial, lateral and torsional vibrations are obtained using a Lagrangian approach. The result leads to a set of non-linear equations with time varying coefficients. A fully coupled model for axial, lateral, and torsional vibrations of drill strings is presented. The bit/formation interactions are assumed ...

Statins are most effective pharmacologically agents to decrease total plasma cholesterol level by competitive inhibition of HMG-Co A reductase. Apart from the well-known LDL and cholesterol lowering effect, statins have been postulated to exert other beneficial effects also called pleotropic or non-lipid effects. Better understanding of various pleotropic effects of statins has prompted a new s...

In this paper, surface and piezoelectric effects on the vibration behavior of nanowires (NWs) are investigated by using a Timoshenko beam model. The electric field equations and the governing equations of motion for the piezoelectric NWs are derived with the consideration of surface effects. By the exact solution of the governing equations, an expression for the natural frequencies of NWs with ...

Background and Aim: Periodontal disease may cause adverse pregnancy outcomes such as low birth weight (LBW) or preterm birth (PTB). In the present study, mothers with one of these two delivery complications were analyzed regarding presence/absence of periodontal disease as a possible risk factor in comparison with related medical risk factors.   Materials and Methods: In this cross-sectiona...

conclusions the findings suggested that according to the ecological conditions of ahvaz, a family history of ms may increase the risk of developing ms. results in both cases and controls, no significant associations were found between arab ethnicity and incidence of ms, marital status and risk of ms in ahvaz, or more than 15-year residency in ahvaz, birth in khuzestan, and month of birth and th...