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Table 2: Diagnostic performance of imaging attributes
Sensitivity Specificity Diagnostic Odds Ratio^{^a} P Value^{^b}
Estimate 95% Confidence Interval Estimate 95% Confidence Interval Estimate 95% Confidence Interval
Neutral MRI^{^c} 70% (14/20) (48%–85%) 100% (17/17) (82%–100%) 78.1 (4.0–1505.9) <.0001
Neutral and flexion MRI 71% (15/21) (50%–86%) 100% (17/17) (82%–100%) 83.5 (4.3–1605.1) <.0001
LOA on neutral images^{^c} 65% (13/20) (43%–82%) 94% (16/17) (73%–99%) 29.7 (3.2–273.4) .0004
Anterior dural shift with flexion^{^d} 76% (16/21) (55%–89%) 94% (16/17) (73%–99%) 51.2 (5.4–488.7) <.0001
Asymmetric cord flattening 48% (10/21) (28%–68%) 65% (11/17) (41%–83%) 1.7 (0.4–6.2) .521
Cord T2 signal 33% (7/21) (17%–55%) 94% (16/17) (73%–99%) 8.0 (0.9–73.2) .053
Abnormal curvature^{^c} 50% (10/20) (30%–70%) 65% (11/17) (41%–83%) 1.8 (0.5–6.9) .510
C8 most affected cervical myotome at EMG with moderate-to-severe change^{^e} 50% (10/20) (30%–70%) 88% (14/16) (64%–97%) 7.0 (1.3–39.1) .0317
↵a The odds ratio for neutral MRI and neutral and flexion MRI was computed by adding 0.5 to each cell (ie, the empiric odds ratio) to account for the zero cell that resulted from 100% specificity.
↵b P values were derived from a 2-tailed Fisher exact test.
↵c One patient did not have neutral images for assessment.
↵d Recorded as present, defined as any degree of dural shift, or absent.
↵e One patient did not have an EMG on record.