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. 2017 Jul 28;32(1):74–80. doi: 10.1038/eye.2017.150

Table 4. Inter-observer variation kappa statistics.

Group Treatment decisions Plus disease ROP stage ROP zone
UK 0.33 0.2 0.25 0.12
ANZ 0.45 0.45 0.35 0.27
INT 0.19 0.18 0.27 0.13
All 0.35 0.3 0.31 0.22