Table 3

The cut-off values of CSA of the idiopathic, diabetic and DPN CTS groups (compared with the control group)
Location Idiopathic CTS group Diabetic CTS group DPN CTS group
Sen. Spec. Area Cuff-off value of CSA Sig. Sen. Spec. Area Cuff-off value of CSA Sig. Sen. Spec. Area Cuff-off value of CSA Sig.
i4 73.7 59.4 0.760 13.0 0.000* 84.2 84.4 0.921 15.3 0.000* 62.5 59.4 0.750 14.0 0.005*
i3 73.7 62.5 0.734 12.8 0.001* 76.3 93.7 0.889 15.3 0.000* 62.5 68.7 0.784 14.0 0.001*
i2 63.2 62.5 0.602 11.4 0.142 63.2 71.9 0.722 12.4 0.001* 50.0 62.5 0.620 11.5 0.179
i1 71.1 62.5 0.727 11.5 0.001* 76.3 62.5 0.813 11.4 0.000* 62.5 62.5 0.716 11.5 0.016*
w 78.9 68.7 0.824 12.5 0.000* 81.6 71.9 0.859 13.4 0.000* 62.5 68.7 0.731 12.5 0.010*
o1 68.4 65.6 0.777 11.5 0.000* 81.6 65.6 0.832 11.2 0.000* 75.0 65.6 0.757 11.7 0.004*
o2 60.5 65.6 0.647 11.5 0.035* 76.3 65.6 0.744 11.0 0.000* 56.3 65.6 0.600 11.5 0.265
o3 73.7 50.0 0.598 9.5 0.159 68.4 56.2 0.698 10.0 0.004* 50.0 56.2 0.688 10.5 0.035*

CSAs = cross-sectional areas; DPN = diabetic polyneuropathy; Sen. =sensitivity; Spec. =specificity; Sig. =significance; ROC = Receiver Operating Characteristic; CTS = carpal tunnel syndrome; NCS = nerve conduction study.

i4, i3, i2, i1, w, o1, o2, and o3 = the 8 points marked.

Unit of CSA = mm2; Sen. = %; Spec. = %.

* = Sig. < 0.05 (asymptotic significance under the ROC curve).

Chen et al.

Chen et al. BMC Medical Imaging 2012 12:15   doi:10.1186/1471-2342-12-15

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