From: Cystathionine β-synthase T833C/844INS68 polymorphism: a family-based study on mentally retarded children
Allele
Transmitted
Non-transmitted
χ2
P value
Relative risk (RR)
HHRR analysis
1
259
264
1.714
0.1905
1.346
2
10
5
TDT analysis
3
6
1.00
0.3173