Table 4:

Comparison between groups with and without arthrogryposis regarding the anteroposterior diameter at different levels of the spinal cord and as the ratio between the spinal cord and vertebral canal anteroposterior diameters^a

AP Diameters (mm)	Spinal Cord Measures			Spinal Cord/Vertebral Canal Ratio
	Ag (n = 4)	No Ag (n = 8)	Pb	Ag (n = 4)	No Ag (n = 8)	Pb
Smallest spinal cord diameters
Cervical	4.5 (4.4–4.9)	5.4 (4.7–5.9)	.073	0.44 (0.41–0.47)	0.57 (0.44–0.60)	.154
High thoracic	3.6 (2.8–4.2)	3.9 (3.6–4.5)	.214	0.39 (0.29–0.41)	0.39 (0.34–0.46)	.570
Conus medullaris base	4.3 (3.5–4.8)	6.3 (5.7–6.5)	.008c	0.44 (0.41–0.47)	0.57 (0.44–0.60)	.016c
Largest spinal cord diameters
Cervical intumescence	4.7 (4.5–5.0)	5.6 (5.4–6.2)	.048c	0.46 (0.41–0.49)	0.58 (0.47–0.63)	.109
Lumbar intumescence	5.0 (3.9–5.8)	7.3 (7.1–7.5)	.008c	0.44 (0.32–0.51)	0.59 (0.56–0.64)	.008c

Note:—AP indicates anteroposterior; Ag, arthrogryposis.

^aData are median (25th–75th percentile).

^bP = Mann-Whitney test.

^cStatistically significant.