We abstracted this specific health informa¬ tion for our study, together with relevant biological, social, and academic data, from the extensive personal records maintained for each student. We also used information from a followup questionnaire completed by 190 nurses (70.6 percent) in 1963, 5 to 9 years after graduation. The illness experience described during this postgraduate interval was assessed acDr. Hillman is professor of environmental medicine and community health,