Table 3.

Average Ratios Observed in Different Study Groups

Sample type	No. of cases	Average FMR1 D:U (range)	Theoretical FMR1 D:U
Male unaffected controls	5	<0.05	0
Male premutation cases	4	<0.05	0
Male full mutation cases	20	0.82 (0.64 to 0.93)	1