Table 1 Ratio between individuals that carry one (1xP) and two (2x) permissive alleles in controls and FSHD2 patients carrying a permissive allele with ≤30 D4Z4 units. Compared to control individuals we find in FSHD2 patients a significant skewing (p = 0.00142) of individuals carrying two permissive alleles. This difference is significant (p = 0.00142) when the shortest permissive allele is 30 units or smaller

From: Deep characterization of a common D4Z4 variant identifies biallelic DUX4 expression as a modifier for disease penetrance in FSHD2

 1xP2xP
Control151 (60,9%)97 (39.1%)
FSHD238 (40.9%)55 (59.1%)