Risk factors for an IgG-Ptx concentration >62.5 EU/ml in individuals >9 years in 2006-07 (n = 5830).*

*for 179 persons (3%) data on one or more variables was missing.**in children below 14 years the mothers highest educational level was asked; low = no education or primary education, middle = junior technical school, lower general or intermediate vocational secondary education, high = higher vocational or higher general secondary education, pre-university or university education.