Table 4. Association between risk genotypes and PCF morphometric traits in 211 patients with CMI.

	ALDH1A2	ALDH1A2	CDX1	FLT1
Measures	rs2899611	rs6493979	rs887343	rs17086609
TD	0.105	0.684	0.226	0.328
Supraocciput	0.477	0.352	0.777	0.829
Clivus	0.922	0.976	0.593	0.769
FM	0.080	0.595	0.227	0.933
PCF area	0.248	0.560	0.556	0.459
OPCF area	0.367	0.636	0.532	0.356
PCF length *	0.750	0.300	0.094	0.983
Tentorium angle	0.456	0.836	0.410	0.118
Basal angulation	0.016	0.067	0.800	0.228
Wackenheim angle	0.006	0.039	0.824	0.146

Data presented are P-values (Scheffé's post-hoc and Kruskal-Wallis tests).

^*Assessed as the distance from the dorsum sellae to the internal occipital protuberance; in bold, P<0.05.TD: tonsillar descent; OPCF: osseous PCF, FM: foramen magnum.