Table 1.

Evaluation of the inter-observer and method-observer agreement on the detection of vessels and solid cores in subsolid nodules.

	Kappa		Accuracy		Sensitivity		Specificity		Precision
	vessel	solid core	vessel	solid core	vessel	solid core	vessel	solid core	vessel	solid core
Inter-observer comparison
O1 vs O2	0.67 (0.56–0.78)	0.50 (0.37–0.63)	0.84	0.76	0.85	0.73	0.82	0.81	0.88	0.88
O1 vs O3	0.61 (0.48–0.73)	0.59 (0.47–0.71)	0.82	0.79	0.79	0.93	0.88	0.70	0.94	0.67
O2 vs O3	0.67 (0.55–0.78)	0.42 (0.28–0.55)	0.85	0.69	0.82	0.94	0.90	0.52	0.95	0.57
Method-observer comparison
Method vs O1	0.70 (0.60–0.81)	0.41 (0.28–0.55)	0.85	0.70	0.81	0.57	0.91	0.86	0.93	0.83
Method vs O2	0.65 (0.53–0.76)	0.34 (0.21–0.48)	0.82	0.65	0.78	0.52	0.90	0.89	0.92	0.91
Method vs O3	0.60 (0.47–0.72)	0.52 (0.39–0.65)	0.80	0.77	0.72	0.69	0.98	0.82	0.99	0.72

The observers are indicated as O1 (observer 1), O2 (observer 2), and O3 (observer 3). Cohen’s κ values are given with 95%-confidence intervals.