Table 3.

Diagnostic performance of standard breast MRI for differentiation between pN1 and pN2–3 if ultrasound showed 1–3 suspicious axillary lymph nodes.

	MRI reader 1 (n = 46)	MRI reader 2 (n = 46)
Sensitivity	84.4% (27/32) [67.2–94.7]	84.4% (27/32) [67.2–94.7]
Specificity	35.7% (5/14) [12.8–64.9]	42.9% (6/14) [17.7–71.1]
PPV	75.0% (27/36) [57.8–87.9]	77.1% (27/35) [59.9–89.6]
NPV	50.0% (5/10) [18.7–81.3]	54.5% (6/11) [23.4–83.3]
Accuracy	69.6% (32/46) [54.2–82.3]	71.7% (33/46) [56.5–84.0]

Abbreviations: PPV, positive predictive value; NPV, negative predictive value.

Data in parenthesis are absolute numbers. Data in brackets are 95% confidence intervals.