Subgroup analysis for the predictive value of sST2 for HF or death showed that sST2 can predict HF or death in patients with AF in the majority of subgroups including age, sex, history of HF, CAD, stroke, hypertension, diabetes, CKD, LVEF, and NT‐proBNP (Figure S3). The gene discussed is NPPB; the disease is hydrops fetalis.