Contribution to the GIF statistic, measuring average relatedness. Contribution to the GIF statistic (y-axis) by genetic relationship (genetic distance, x axis) between all pairs of related CFS cases compared to all pairs of related controls. Genetic distance 1 = parent/offspring, 2-siblings or grandparent/grandchild, 3 = avunculars, and so forth).
Albright et al. BMC Neurology 2011 11:62 doi:10.1186/1471-2377-11-62