The ethnic origin of all FSHD patients is predominantly Caucasian, in FSHD1 this makes up to 89.9 % (427) of those registered, [Asian 20 (4.2 %), black African 1 (0.2 %), mixed 4 (0.84 %), declined 13 (2.7 %), other 10 (2.1 %)] and in FSHD2 8 of the 9 (88.9 %) patients reported Caucasian ethnicity with the remaining patients of unknown ethnic origin. Here, SMCHD1 is linked to facioscapulohumeral muscular dystrophy.