Table 1.

Demography.

Number of Subjects	30
Sex
F	20 (64%)
M	10 (36%)
Cognitive level
Severe ID	7 (23%)
Moderate ID	13 (43%)
Mild ID	10 (33%)
Age for regression (years)
12–15	10
15–20	6
20–25	8
25–30	6
Mean for girls	18
Mean for boys	21
Number of years of follow-up
<2	2
2–5	9
5–10	5
>10	14