title: Childhood acute lymphoblastic leukaemia in relation to population mixing around the time of birth in South Hungary.
abstract: In a retrospective epidemiological study of 481,984 live births in South Hungary, we investigated whether higher levels of population mixing around the time of birth is a risk factor for acute lymphoblastic leukemia (ALL) under age 5 years. Poisson regression was used to investigate the relationship between risk of ALL and the population-mixing index based on the number of incomers in each county district for each year, standardized to have a range of 0-1. Among all children, the risk of ALL increased significantly with increasing population mixing around the time of birth (trend across the range of 0-1 RR = 2.1 95% CI: 1.02-4.44). This effect was more marked for boys (RR = 3.1 95% CI: 1.13-8.51), which supports a sex-specific effect of exposures on risk of ALL.
authors.affiliation: Department of Medical Informatics, University of Szeged, Szeged, Hungary.
authors.forename: Tibor A
authors.initials: TA
authors.lastname: Nyári
authors.forename: Pál
authors.initials: P
authors.lastname: Kajtár
authors.forename: Katalin
authors.initials: K
authors.lastname: Bartyik
authors.forename: László
authors.initials: L
authors.lastname: Thurzó
authors.forename: Louise
authors.initials: L
authors.lastname: Parker
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D006814:Hungary / Q000453:epidemiology; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D016012:Poisson Distribution; D011157:Population Dynamics; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000453:epidemiology*; D012189:Retrospective Studies; D012307:Risk Factors