Table 3
Summary of published recurrence risks for mental retardation by sex of proband
Reference
Affected male
Affected female
Brother
Sister
All siblings
Brother
Sister
All siblings
Turner
et al
82
2–9%
3.5–4%
Bundey
et al
83
6.7%
3.2%
5%
4.4%
6.3%
5.4%
Herbst
et al
84
6%
2.3%
4.3%
2.9%
5.6%
4.2%
Bundey
et al
85
10%
5%
7.5%
Costeff
et al
86
14%
14%
14%
9.6%
9.6%
9.2%
Van Naarden Braun
et al
88
8.4%
8.4%