Table 3.

Area Under the Receiver-Operating Characteristic Curve

Index text	AUC (95% CI)	p
Whole volume
BIA resistance ratio (5 kHz)
Clinical stage	0.900 (0.849–0.951)	<0.001
Water	0.924 (0.856–0.992)	<0.001
BIA resistance ratio (1 kHz)
Clinical stage	0.911 (0.862–0.960)	<0.001
Water	0.927 (0.858–0.995)	<0.001
ILD
Clinical stage	0.875 (0.821–0.929)	<0.001
Water	0.933 (0.874–0.992)	<0.001
Segment A
SEG	0.966 (0.933–0.999)	<0.001
rSEG	0.891 (0.814–0.968)	<0.001
Clinical stage	0.769 (0.695–0.844)	<0.001
Water	0.878 (0.808–0.948)	<0.001
Segment B
SEG	0.829 (0.741–0.917)	<0.001
rSEG	0.854 (0.789–0.919)	<0.001
Clinical stage	0.846 (0.785–0.907)	<0.001
Water	0.919 (0.860–0.978)	<0.001
Segment C
SEG	0.872 (0.745–0.917)	<0.001
rSEG	0.948 (0.923–0.965)	<0.001
Clinical stage	0.859 (0.791–0.922)	<0.001
Water	0.933 (0.891–0.972)	<0.001
Segment D
SEG	0.914 (0.874–0.972)	<0.001
rSEG	0.940 (0.920–0.962)	<0.001
Clinical stage	0.830 (0.721–0.897)	<0.001
Water	0.917 (0.865–0.988)	<0.001

Arm segments were designated as segment A (7–14 cm above the medial olecranon), segment B (at level −7 cm above the medial olecranon), segment C (at level −7 cm below the medial olecranon), and segment D (7–14 cm below the medial olecranon). Arm volume measurements were measured by water displacement by using a graduated plastic cylinder, and the ILD was dichotomized with the cut-off point (≥200 mL) for the diagnosis of lymphedema (water). The clinical stage is divided into reversible stage (stages 0, 1) and irreversible stage (stages 2, 3, 4).

AUC, area under the curve; CI, confidence interval; SEG, subcutaneous echogenicity; rSEG, revised subcutaneous echogenicity.