TABLE 2

Family structure of proband cases and controls with at least one first- or second-degree relative identified from the Swedish Multi-Generation Register

Cases#Controls#
RelativesRelatives per caseRelativesRelatives per control
First-degree relatives
 All relatives86 1364.2 (2.2)713 7084.3 (2.2)
 Parents28 8351.4 (0.9)245 0541.5 (0.8)
 Full siblings24 1041.2 (1.4)203 9891.2 (1.4)
 Offspring33 1971.6 (1.4)264 6651.6 (1.4)
Second-degree relatives
 Half siblings75112.1 (1.6)15 2022.1 (1.5)

Data are presented as n or mean±sd. #: probands with ≥1 first-degree relative n=20 322 cases, n=164 628 controls; probands with ≥1 second-degree relative n=3558 cases, n=7263 controls.