Table 1.

Angle values of the four studied groups

CCJM	CCJM angles (deg)
	Minimum	Maximum	Mean	SD
BA BI I	104	155	128	19.35
BA BI II	115	158	130	11.11
BA CM	102	129	117	7.15
BA CTRL	107	132	119	7.11
CC BI I	77	145	123	24.50
CC BI II	80	144	117	16.46
CC CM	123	180	150	12.43
CC CTRL	129	175	148	9.88
Boo BI I	124	190	158	23.41
Boo BI II	153	236	183	24.72
Boo CM	105	175	136	15.26
Boo CTRL	103	148	126	9.40
CL BI I	125	157	138	11.81
CL BI II	113	159	137	14.89
CL CM	115	180	153	14.78
CL CTRL	130	189	158	13.89

BA basal angle, CC clivus canal angle, Boo Boogard’s angle, CL cervical lordosis angle, BI basilar invagination, CM Chiari malformation, CTRL control group