Measurements of the spinal cord^*

	Patients		Controls†	P Value
	Mean ± SD	95% CL	Mean ± SD
Anteroposterior diameter (mm)
C2	5.6 ± 1.0	5.0–6.2	9.5 ± 0.6	<.001
T6	4.4 ± 0.7	4.0–4.9	7.8 ± 0.7	<.001
T11	4.8 ± 0.9	4.3–5.3	8.3 ± 1.1	<.001
Coronal diameter (mm)
C2	10.2 ± 0.8	9.7–10.7	13.3 ± 1.1	<.001
T6	6.8 ± 0.6	6.5–7.2	10.2 ± 0.7	<.001
T11	8.1 ± 0.9	7.5–8.7	10.6 ± 1.5	<.001
Level cross-sectional area (mm2)
C2	46.5 ± 8.4	40.7–52.3	93.9 ± 11.4	<.001
T6	24.4 ± 4.9	21.2–27.7	59.9 ± 7.4	<.001
T11	31.7 ± 7.1	26.5–37.0	78.4 ± 21.1	<.001

Note:—CL indicates confidence limit.

^*Student 2-tailed t test was used for comparisons.

^†Measurements of the controls from Krabbe et al.¹⁰