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Table 2:

Diagnostic performance of MR imaging for the discrimination of early NPC from BH

VolumeSize AsymmetrySignal AsymmetryDeep Mucosal White LineAdenoid
Test positive for NPCVolume ≥ 5.01 cm3%ΔA ≥ 33.7%Signal asymmetry presentFocal loss of the deep mucosal white lineSepta absent or distorted (excluding septa distorted by cysts)
n = 333 (NPC = 189, BH = 144)n = 333 (NPC = 189, BH = 144)n = 333 (NPC = 189, BH = 144)n = 253 (NPC = 180, BH2 = 73)n = 172 (NPC = 111, BH2 = 61)
Area under the curve (95% CI)0.676 (0.618–0.734)0.948 (0.926–0.971)
P value<.001<.001
True-positive (No.)119167161153111
False-positive (No.)471326109
True-negative (No.)971311186352
False-negative (No.)702228270
Sensitivity (%)63.088.485.285.0100.0
Specificity (%)67.491.081.986.385.2
Positive predictive value (%)71.792.886.193.992.5
Negative predictive value (%)58.185.680.870.0100.0
Accuracy (%)64.989.583.885.494.8