This dissertation has two areas of focus: learning and developmental disorders (LDDs) and polyfluoroalkyl chemicals (PFCs). Epidemiological and exposure assessment methods are applied to each. The first paper used geographic location as a surrogate for exposure and broadly assesses the effect of the environment, both physical and social, on LDD…

Using the Student Inventory File of the OBOR information system, detailed analyses were conducted on 1971-1975 enrollments in Ohio by institution, count, part-time versus full-time status, age, rank, day-evening, marital status, etc. Data on out-of-state enrollments, graduate students, and professional students were also tabulated. (LBH)