Notably, FSTL1 demonstrated a significant negative correlation with AHI (r2 = -0.195, p = 0.013) in the general population and an even stronger correlation with the OSA group (r2 = -0.376, p = 0.019, Figure 2A), suggesting a link between FSTL1 and OSA severity. The gene discussed is FSTL1; the disease is obstructive sleep apnea syndrome.