Table 4 Diagnostic performance of NBI for JNET Type 2A lesions before and after the lecture

Sensitivity

57.4 (55.7–58.8)

63.9 (62.5–65.1)⁺

63.7 (61.9–65.2)

86.0 (85.0–86.6)⁺

86.3 (85.2–86.3)

90.2 (88.7–96.6)⁺⁺

Specificity

91.6 (89.3–93.6)

94.5 (92.4–96.1)

89.3 (86.8–91.5)

98.1 (96.7–98.9)⁺

100 (98.5–100)

99.1 (97.1–99.8)

PPV

90.6 (87.9–92.7)

94.2 (92.0–95.8)⁺⁺

89.3 (86.8–91.5)

98.4 (97.3–99.1)⁺

100 (98.7–100)

99.3 (97.7–99.8)

NPV

60.6 (59.0–61.9)

65.2 (63.8–66.3)

63.7 (61.9–65.2)

83.3 (82.1–84.1)⁺

84.0 (82.7–84.0)

87.8 (86.0–88.4)

Accuracy

71.7 (69.7–73.3)

76.7 (75.0–78.0)⁺

74.4 (72.3–76.1)

91.0 (89.9–91.7)⁺

92.0 (90.7–92.0)

93.9 (92.2–94.4)⁺⁺

κ-Value

0.126

0.112

0.13

0.357

0.461

0.0697