Table 3.

Sensitivity and specificity of nerve measurements for the diagnosis of CR

Threshold	Sensitivity (%)§	Specificity (%)§	FP	FN	LR+	LR-	AUC§	P-value
C5NR-CSA							0.97
8.5 mm2	100 (96.4–100)	83 (77.5–87.8)	17	0	5.9	0	(0.94–1)
9.6	90 (82.7–95.2)	91 (86.2–94.3)	9	10	10	0.11
13.6	80 (71.3–87.6)	100 (98.3–100)	0	20		0.2
C5NR-ΔCSA							0.91	0.3
0.6	100 (96.4–100)	30 (24.1–36.9)	70	0	1.4	0	(0.79–1)
4.0	90 (82.7–95.2)	93 (89.0–96.1)	7	10	12.9	0.11
7.3	50 (94.7–100)	100 (98.3–100)	0	50		0.5
C6NR-CSA							0.98
12.6	100 (96.4–100)	72 (65.7–78.0))	28	0	3.6	0	(0.96–0.99)
15	92 (85.1–96.6)	90 (85.2–93.6)	10	8	9.2	0.09
17	79 (70.3–86.8)	98 (95.4–99.5)	2	21	39.5	0.21
19	60 (49.6–69.4)	100 (98.3–100)	0	40		0.4
C6NR-ΔCSA							0.89	0.001
2.2	100 (96.4–100)	30 (24.1–36.7)	70	0	1.4	0	(0.84–0.95)
3	81 (72.4–88.4)	74 (67.6–79.7)	26	19	3.1	0.26
7	69 (58.7–77.5)	98 (95.4–99.5)	2	31	34.5	0.32
11.3	25 (17.4–35.1)	100 (98.3–100)	0	75		0.75
C7NR-CSA							0.97
10	100 (96.4–100)	63 (56.2–69.4)	37	0	2.7	0	(0.95–0.99)
15	89 (81.5–94.5)	96 (92.3–98.1)	4	11	22.3	0.11
21	25 (17.4–35.1)	100 (98.3–100)	0	75		0.75
C7NR-ΔCSA							0.93	0.07
1.7	98 (93.1–99.8)	57 (50.2–63.7)	43	2	2.3	0.04	(0.89–0.97)
5	80 (71.4–878.6)	94 (90.1–96.8)	6	20	13.3	0.21
12	32 (23.4–42.3)	100 (98.3–100)	0	68		0.68

^§The data in parentheses are 95% confidence intervals

^¶The data are the differences in AUCs between CSA and ΔCSA

CR cervical radiculopathy, NR nerve root, CSA cross-sectional area, ΔCSA laterality of the cross-sectional area, FP false positive, FN false negative, LR+ positive likelihood ratio, LR− negative likelihood ratio

The bold type indicating the better threshold value