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Type of classification
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Sensitivity (%) (95% CI)
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Specificity (%) (95% CI)
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PPV (%) (95% CI)
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NPV (%) (95% CI)
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Accuracy (%) (95% CI)
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Type 1
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< 10 mm
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81.2 (63.6–92.8)
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99.4 (97.9–99.9)
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92.9 (76.5–99.1)
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98.2 (96.2–99.3)
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97.8 (95.8–99.1)
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≥ 10 mm
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100.0 (61.5–100.0)
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100.0 (96.5–100.0)
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100.0 (61.5–100.0)
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100.0 (96.5–100.0)
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100.0 (96.7–100.0)
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All size
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86.0 (72.1–94.7)
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99.6 (98.5–100.0)
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94.9 (82.7–99.4)
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98.8 (97.4–99.6)
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98.5 (97.1–99.4)
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Type 2
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< 10 mm
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99.1 (97.4–99.8)
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82.4 (65.5–93.2)
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98.2 (96.2–99.3)
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90.3 (74.2–98.0)
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97.6 (95.4–98.9)
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≥ 10 mm
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99.3 (96.2–100.0)
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90.0 (68.3–98.8)
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98.6 (95.2–99.8)
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94.7 (74.0–99.9)
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98.2 (94.8–99.6)
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All size
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99.2 (97.9–99.8)
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85.2 (72.9–93.4)
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98.3 (96.8–99.3)
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92.0 (80.8–97.8)
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97.8 (96.1–98.8)
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Type 3
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< 10 mm
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100.0 (9.4–100.0)
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99.7 (98.5–100.0)
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66.7 (9.4–99.2)
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100.0 (98.5–100.0)
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99.7 (98.5–100.0)
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≥ 10 mm
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77.8 (40.0–97.2)
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99.4 (96.5–100.0)
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87.5 (47.3–99.7)
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98.7 (95.5–99.8)
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98.2 (94.8–99.6)
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All size
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81.8 (48.2–97.7)
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99.6 (98.6–100.0)
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81.8 (48.2–97.7)
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99.6 (98.6–100.0)
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99.3 (98.1–99.8)
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Determination of neoplastic polyp (Type 2/3)
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< 10 mm
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99.4 (97.9–99.9)
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81.2 (63.6–92.8)
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98.2 (96.2–99.3)
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92.9 (76.5–99.1)
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97.8 (95.8–99.1)
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≥ 10 mm
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100.0 (96.5–100.0)
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100.0 (61.5–100.0)
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100.0 96.5–100.0)
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100.0 (61.5–100.0)
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100.0 (96.7–100.0)
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All size
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99.6 (98.5–100.0)
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86.0 (72.1–94.7)
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98.8 (97.4–99.6)
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94.9 (82.7–99.4)
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98.5 (97.1–99.4)
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- The sensitivity, specificity, PPV, NPV, and accuracy of each type do not differ significantly between polyp sized < 10 mm and ≥ 10 mm
- NICE classification narrow-band imaging international colorectal endoscopic classification, CI confidence interval, PPV positive predictive value, NPV negative predictive value
