Supplementary Material for: Risk Factors for Coronary Artery Aneurysm in a Chinese Pediatric Population with Kawasaki Disease at Low Risk of Intravenous Immunoglobulin Resistance: A Retrospective Cohort Study

INTRODUCTION: Multiple scoring systems for predicting intravenous immunoglobulin (IVIG) resistance have been developed. Although low-scoring patients with Kawasaki disease (KD) have a favorable prognosis, many develop coronary artery aneurysms (CAA). Herein, we determined the risk factors for developing CAA among patients with KD with low risk of IVIG resistance. METHODS: We compared 14 scoring systems for predicting IVIG resistance among patients with KD hospitalized from 2003 to 2022. Patients were risk-stratified using an optimal scoring system. Association between baseline characteristics and CAA development was assessed within the low-risk group. RESULTS: Overall, 664 pediatric patients with KD were included; 108 (16.3%) had IVIG resistance, and the Liping scoring system had the highest area under the curve (0.714). According to this system, 444 (66.9%) patients with KD were classified as having low risk of developing IVIG resistance (<5 points). CAA development was significantly associated with male sex (odds ratio [OR], 1.946; 95% CI: 1.015–3.730), age <6 months at fever onset (OR, 3.142; 95% CI: 1.028–9.608), and a baseline maximum Z score of ≥2.72 (OR, 3.451; 95% CI: 2.582–4.612). CAA incidence increased with the number of risk factors, and comparisons with a Kobayashi score of <5 points among patients with KD revealed similar results. CONCLUSION: Predicting the response to IVIG might help in further reducing CAA development in patients with KD.