Table 2. The cutoff values for diagnosing and grading the severity of carpal tunnel syndrome derived from our study:

Ultrasound parameter	CSA2–1	CSA2	CSA3
Cutoff value with highest sensitivity and specificity for diagnosing CTS	2.85 mm 2 (95.18 and 100%)	11.05 mm 2 (87.5 and 80%)	10.95 mm 2 (80.72 and 100%)
Diagnostic accuracy	95.45%	87.5%	81.82%
Cutoff for severe cases	6.25 mm 2	15.75 mm 2	14.15 mm 2
Cutoff for moderate cases	5.65 mm 2	14.75 mm 2	13.35 mm 2
Cutoff for mild cases	4.35 mm 2	12.85 mm 2	11.9 mm 2
Cutoff for negative cases	2.75 mm 2	12.1 mm 2	10.65 mm 2

Abbreviations: CSA1, cross-sectional area 1; CTS, carpal tunnel syndrome.