Little is known empirically about intraclass correlations (ICCs) for multisite cluster randomized trial (MSCRT) designs, particularly in science education. In this study, ICCs suitable for science achievement studies using a three-level (students in schools in districts) MSCRT design that block on district are estimated and examined. Estimates of…

Preparation for Parenthood is a city-wide program designed for the purpose of: (1) decreasing the complication of pregnancy for school-age girls due to poor nutrition and poor prenatal care, and consequently reducing infant mortality, mental retardation, and birth defects; and (2) enabling the girls to continue their educational ambitions, thus…