The employment rate for mothers with young children has increased dramatically over the past 25 years. Estimating the effects of maternal employment on children's development is challenged by selection bias and the missing data endemic to most policy research. To address these issues, this study uses propensity score matching and multiple imputation. The authors compare outcomes across 4 matern...

A graph G is (j, k)-colorable if its vertices can be partitioned into subsets V1 and V2 such that in G[V1] every vertex has degree at most j and in G[V2] every vertex has degree at most k. We prove that if k ≥ 2j + 2, then every graph with maximum average degree at most 2 ( 2− k+2 (j+2)(k+1) ) is (j, k)colorable. On the other hand, we construct graphs with the maximum average degree arbitrarily...

OBJECTIVE To determine the most effective way of helping people with severe mental illness to obtain competitive employment-that is, a job paid at the market rate, and for which anyone can apply. DESIGN Systematic review. PARTICIPANTS Eligible studies were randomised controlled trials comparing prevocational training or supported employment (for people with severe mental illness) with each ...

This paper proposes reliability and maintenance models for systems suffering random shocks arriving according to a non-homogeneous Poisson process. The system degradation process include two stages: from the installation of new an initial point defect (normal stage), then that failure (defective following delay time concept. By employing virtual age method, impact external on is characterized b...

OBJECTIVES We sought to measure the difference in employment rates between HIV-seropositive and HIV-seronegative persons and to establish whether this difference varied according to the HIV-infected persons' socioeconomic position as defined by education level. METHODS We used data from the VESPA (VIH: Enquête Sur les Personnes Atteintes) study, a large cross-sectional survey conducted among ...