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
AP Diameters (mm)	Ag (n = 4)	No Ag (n = 8)	P^{^b}	Ag (n = 4)	No Ag (n = 8)	P^{^b}
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)	.008^{^c}	0.44 (0.41–0.47)	0.57 (0.44–0.60)	.016^{^c}
Largest spinal cord diameters
Cervical intumescence	4.7 (4.5–5.0)	5.6 (5.4–6.2)	.048^{^c}	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)	.008^{^c}	0.44 (0.32–0.51)	0.59 (0.56–0.64)	.008^{^c}

Note:—AP indicates anteroposterior; Ag, arthrogryposis.
↵a Data are median (25th–75th percentile).
↵b P = Mann-Whitney test.
↵c Statistically significant.