Baseline, median (IQR) | | | | |

RCA *z* score | 2.8 (1.2 to 3.5) | 2.6 (1.6 to 3.8) | 2.6 (1.6 to 3.3) | .46 |

LAD *z* score | 2.5 (0.9 to 3.5) | 3.1 (2.7 to 3.9) | 3.2 (2.8 to 4.4) | .12 |

Maximum coronary *z* score | 3.2 (2.8 to 4.2) | 3.6 (2.9 to 4.3) | 3.5 (3.0 to 4.5) | .39 |

At 12 mo postonset | | | | |

Maximum coronary *z* score, median (IQR) | 0.6 (−0.3 to 1.5) | 1.3 (0.6 to 2.2) | 1.0 (0.5 to 1.8) | .21 |

Regression aneurysm^{b}, *n* (%) | 26 (79) | 43 (74) | 24 (80) | .82 |

Maximum coronary *z* score within first 12 mo, median (IQR) | 3.5 (2.9 to 6.3) | 4.0 (3.0 to 5.0) | 3.6 (3.2 to 5.3) | .85 |

Giant aneurysms, *n* (%) | 4 (12) | 5 (9) | 1 (3) | .49 |

Increase in coronary dimensions during follow-up | | | | |

Maximum ↑ in *z* score^{c}, median (IQR) | 1.5 (0.0 to 3.2) | 0.3 (0.0 to 1.0) | 0.3 (0.0 to 1.0) | .057 |

↑ in *z* score >1 SD unit, *n* (%) | 19 (58) | 14 (24) | 7 (23) | .003 |

↑ in *z* score >2 SD unit, *n* (%) | 8 (24) | 6 (10) | 5 (17) | .058 |