Association between 𝜺2/3/4, Promoter Polymorphism (−491A/T, −427T/C, and −219T/G) at the Apolipoprotein E Gene, and Mental Retardation in Children from an Iodine Deficiency Area, China

Table 4

Pairwise linkage disequilibrium (𝐷^′/𝑟²) of −491A/T, −427T/C, −219T/G, and 𝜀2/𝜀3/𝜀4 polymorphisms.

SNPs	LD estimate (𝐷^′ or 𝑟^2) for marker pair
	−491A/T	−427T/C	−219T/G	ε2/ε3/ε4
−491A/T	—	0.921	0.241	0.216
−427T/C	0.002	—	0.895	0.589
−219T/G	0.001	0.171	—	0.286
ε2/ε3/ε4	0.001	0.075	0.049	—

The standardized 𝐷^′ values are shown above the diagonal, and the 𝑟² values are shown below the diagonal.