APOB and chronic kidney disease: Compared to the lower Lp(a) group (≤ 300 mg/L), the higher Lp(a) group (> 300 mg/L) was older (P < 0.001), exhibited a higher prevalence of CKD (P = 0.001), showed a lower eGFR (P < 0.001), presented with a higher Gensini score (P < 0.001) and a greater number of diseased vessels (P < 0.001), demonstrated a lower LVEF (P = 0.042), recorded higher SBP (P = 0.017), displayed elevated TC (P = 0.007), LDL-C (P < 0.001), and ApoB levels (P = 0.002), showed increased fibrinogen levels (P < 0.001), and experienced a higher all-cause and cardiovascular mortality rate (P < 0.001).