Table 4.

Descriptive statistics for comparison of CMI participants with related conditions and control participants.

No.	Measurements	Syringomyelia		Pseudotumorcerebi		Ehlers-Danlos syndrome		Scoliosis		Craniocervical instability
		Meandiff	Cohen's d	Meandiff	Cohen's d	Meandiff	Cohen's d	Meandiff	Cohen's d	Meandiff	Cohen's d
28	McRae line length	−0.37	−0.19	1.64	0.42*	2.23	0.59**	1.65	0.59**	1.19	0.23
24	Tonsillar position	10.3	2.26**	10.1	1.81**	7.56	1.61**	9.36	2.31**	9.30	1.59**
16	Fastigium height	−2.5	−0.89**	−3.08	−0.84**	−2.21	−0.73**	−2.42	−0.94**	−2.03	−0.59**
17	Pons height	−1.85	−0.53**	−2.38	−0.52*	−1.98	−0.52*	−1.37	−0.45*	−2.91	−0.66**
18	Corpus Callosum height	−1.81	−0.58**	−3.81	−0.77**	−2.13	−0.56**	−2.84	−0.82**	−2.90	−0.64**
3	Clivus length	−3.63	−0.77**	−5.16	−0.79**	−5.61	−0.96**	−3.56	−0.74**	−6.08	−0.94**
1	PCF height	−0.66	−0.18	−2.16	−0.24	−0.35	−0.04	−1.55	−0.28	−1.31	−0.20
4	PCF area (mm2)	−71.5	−0.28	−162	−0.32	−65.3	−0.15	−108	−0.30	−131	−0.31
5	PCF osseous area (mm2)	−148	−0.62**	−255	−0.67**	−198	−0.62**	−164	−0.57**	−252	−0.71**
20	Basal angle (°)	6.52	0.71**	7.85	0.59**	8.52	0.72**	4.46	0.49*	4.60	0.36*
23	Wackenheim angle (°)	−6.37	−0.74**	−4.11	−0.54*	−3.69	−0.54*	−7.55	−0.77**	−2.40	−0.33
7	Boogard angle (°)	5.30	0.63**	3.27	0.32	4.80	0.51*	3.27	0.42*	4.24	0.38*
10	AP dura-Op	0.72	0.17	1.22	0.41*	1.49	0.46*	1.52	0.55**	1.22	0.30
12	Basion to PAL	0.64	0.37*	2.71	0.78**	2.42	0.76**	2.955	1.00**	1.45	0.38*
13	Odontoid angle (°)	−4.13	−0.63**	−1.72	−0.23	−3.15	−0.41*	−3.57	−0.55**	−4.37	−0.53*
25	Intracranial height	−1.59	−0.34*	−3.01	−0.39*	−2.44	−0.37*	−2.31	−0.41*	−3.37	−0.44*
26	Intracranial diameter	−2.47	−0.28	−2.98	−0.29	−0.89	−0.08	−1.98	−0.20	−3.18	−0.27
27	Intracranial area (mm2)	−281	−0.26	−332	−0.23	−168	−0.12	−309	−0.25	−446	−0.29

Measurements in millimeters unless otherwise noted, Meandiff: RC-control. Italicized and bold values show changes in significant and trending results when controlling for age and/or BMI group differences. Measurements highlighted in blue were found to be significantly different in all 12 PCs.

^*p < 0.05,

^**p < 0.002.