Table 3. Clustered findings for diagnosis of cervical spine myelopathy.

Clustered results	Sensitivity (95% CI)	Specificity (95% CI)	Positive likelihood ratio (95% CI)	Negative likelihood ratio (95% CI)	Post-test probability of CTS (%)
1 of 5 positive tests	0.94 (0.89–0.97)	0.31 (0.27–0.32)	1.4 (1.2–1.4)	0.18 (0.12–0.42)	43
2 of 5 positive tests	0.39 (0.33–0.46)	0.88 (0.84–0.92)	3.3 (2.1–5.5)	0.63 (0.59–0.79)	64
3 of 5 positive tests	0.19 (0.15–0.20)	0.99 (0.97–0.99)	30.9 (5.5–181.8)	0.81 (0.79–0.87)	94
4 of 5 positive tests	0.09 (0.06–0.09)	1.0 (0.98–1.0)	Inf (3.9–Inf)	0.91 (0.90–0.95)	99+

Note: Five tests are included in the rule: (1) gait deviation; (2) +Hoffmann’s test; (3) inverted supinator sign; (4) +Babinski test; and (5) age >45 years. The associated post-test probability values are based on a pre-test probability of 35%.