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Table 1 Interobserver variability (IOV) among 16 centers in routine clinical practice

From: Interobserver variability in target volume delineation in definitive radiotherapy for thoracic esophageal cancer: a multi-center study from China

 

Volume (cc)

Dice similarity coefficient

Mean (smallest-largest)

Mean (95% CI)

Case 1

GTV-T

101.2 (74.7–127.7)

0.86 (0.83–0.88)

GTV-N

12.9 (4.3–30.5)

0.50 (0.41–0.58)

CTV

333.8 (204.4–442.0)

0.80 (0.76–0.82)

Case 2

GTV-T

27.3 (21.8–34.2)

0.81 (0.79–0.83)

GTV-Na

2.2 (0–19.4)

0.26 (0.08–0.43)

CTV

179.8 (94.7–307.5)

0.74 (0.68–0.79)

Case 3

GTV-T

37.9 (30.1–50.8)

0.79 (0.76–0.82)

GTV-Na

11.8 (5.7–32.3)a

0.39 (0.34–0.43)

CTV

367.6 (95.9–652.9)

0.65 (0.57–0.73)

  1. CI confidence interval
  2. *GTV-Ns do not conform to normal distribution as per the Shapiro–Wilk test, so the median is used instead of the mean