. Author manuscript; available in PMC: 2013 May 15.

Published in final edited form as: J Ultrasound Med. 2011 Dec;30(12):1657–1667. doi: 10.7863/jum.2011.30.12.1657

Table 4.

Correlation of Measurements to Nerve Conduction Study Data and Categorical Severity of Carpal Tunnel Syndrome Diagnosis in Symptomatic Patients (n = 47 patients, 83 wrists)

Variable	DML, r	SCV, r	Severity, tau-b
Age	0.262	−0.0285	0.208
Body mass index	0.226	−0.409^a	0.344^b
Wrist ratio	0.259^b	−0.127	0.183^b
CSA in forearm	0.211	−0.249^b	0.161
CSA at distal radius	0.515^a	−0.595^a	0.517^a
CSA at pisiform	0.678^a	−0.746^a	0.595^a
Retinacular bulge	0.467^a	−0.466^a	0.385^a
Flattening ratio at pisiform	0.082	0.025	0.021
CSA change: radius-forearm	0.493^a	−0.567^a	0.509^a
CSA change: pisiform-forearm	0.648^a	−0.706^a	0.582^a
CSA ratio: radius/forearm	0.434^a	−0.517^a	0.430^a
CSA ratio: pisiform/forearm	0.578^a	−0.623^a	0.522^a

CSA indicates cross-sectional area; DML, distal motor latency; and SCV, sensory conduction velocity.

Significant at P < .001.

Significant at P < .05.