Welcome to the Collaborative Perinatal Project!

The Collaborative Perinatal Project (CPP) was a prospective study of factors influencing pregnancy and birth outcomes. The original cohort consisted of 48,000 pregnant women who were enrolled when they presented for prenatal care at 12 university hospital clinics located throughout the United States between 1959 and 1965. Approximately 55,000 children were born in the study. The children were systematically assessed for neurological, physical and psychological development through age eight years. Extensive questionnaire data are available from all visits.