Pityriasis rosea in Rochester, Minnesota, 1969 to 1978

摘要: A population-based epidemiologic study of pityrtasts rosea was developed for Rochester, MN, a recent 10-year period Nine hundred thirty-nine patients with pityriasis (340 male and 599 female patients) who resided within Rochester city limits at the time diagnosis made were included. The average annual incidence rate this disease 172 2 per 100,000 person-years (158 9 100,000, adjusted to 1970 U S white population). Female predominated by margin 1 5 0. More than 75% between ages 10 35 years, mean age 22 7 years range months 78 years. There recurrence illness 8% after an 45 follow-up highest noted 1972, following which there steady significant decline in incidence. significantly higher colder warmer season. Patients twenty-one close-contact pairs experienced varying intervals. Recent past infections or history atopy nearly one third cases.