Table 3 Diagnostic performance of NBI for JNET Type 1 lesions before and after the lecture

Sensitivity

73.4 (67.9–78.0)

89.0 (84.5–92.4)⁺

77.3 (75.0–77.3)

97.4 (94.6–98.9)

100 (97.1–100)

100 (97.1–100)

Specificity

97.0 (96.3–97.7)

97.6 (96.9–98.0)

100 (99.7–100)

99.3 (98.9–99.5)

100 (99.6–100)

100 (99.6–100)

PPV

77.4 (71.7–82.2)

83.5 (79.3–86.7)

100 (97.1–100)

94.9 (92.2–96.4)⁺⁺

100 (97.1–100)

100 (97.1–100)

NPV

96.3 (95.6–97.0)

98.4 (97.8–98.9)⁺

96.9 (96.6–96.9)

99.6 (99.2–99.8)⁺

100 (99.6–100)

100 (99.6–100)

Accuracy

94.1 (92.8–95.2)

96.5 (95.4–97.3)⁺

77.2 (96.7–97.2)

99.0 (98.4–99.4)⁺

100 (99.3–100)

100 (99.3–100)

κ-Value

0.0408

0.128

− 0.00525

0.0651

1.0

1.0