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.