\input zb-basic \input zb-matheduc \iteman{ZMATH 2013a.00276} \itemau{Mattsson, Linda} \itemti{Demographics of self-selected participants in mathematical tracks in Swedish upper secondary school.} \itemso{Math. Enthus. 9, No. 3, 271-302 (2012).} \itemab Summary: This study investigates the three demographic factors gender, geographical origin and parents educational level among self-selected students in mathematical tracks in Swedish upper secondary school $(n=147)$. Comparisons are made, through statistical tests of significance, with corresponding student distributions on the closely related natural science program $(n=1528)$. Data is obtained from statistics Sweden. Results confirm that females are under-represented in mathematical tracks $(p<0,01)$ and that parents of students in mathematical tracks have higher educational level than parents of students in the comparison group $(p<0,05)$. Results do not show that students with foreign background are under-represented in mathematical tracks, but raise questions about under-representation of Swedish students. Possible implications of these findings for these and similar programs are discussed. \itemrv{~} \itemcc{C63 C64} \itemut{mathematical track; demographics; Sweden; self-selection; gifted; choices} \itemli{} \end