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Coronary artery abnormalities
| Japanese criteria <5 years31 | Japanese criteria ≥5 years31 | United States criteria1 | |
|---|---|---|---|
| No involvement | Z score <2 | ||
| Transient dilatation | Z score ≥2 to <2.5 | ||
| Small | ≤4 mm | 1.5×diameter of adjacent segment | Z score ≥2.5 to <5 |
| Medium | >4 mm to ≤8 mm | 1.5–4×diameter of adjacent segment | Z score ≥5 to <10 |
| Giant | >8 mm | >4×diameter of adjacent segment | Z score ≥10 |
