Table 2.

Comparison of frequency of ≥20 repeats in Caucasian populations (27).

Population	Allelic frequency of ≥20 repeats	Expansions in controls (n)	Reference
Italian (our study)	0.31	0	Present study
UK	0.42	11	Beck et al. (34)
Irish	0.41	0	Fahey et al. (35)
European/Asian/North American/Australian	0.52	1	Theuns et al. (32)
North American	0.38	0	Rutherford et al. (36)
Finnish	0.89	6	Kaivola et al. (27)