AHR and chronic kidney disease: The serum AhR levels ≥ 37.7 pg/mL remained to be an independent risk factor both in patients aged <63 years (OR = 2.218, 95% CI: 1.126–4.371; p = 0.021) and in those aged ≥63 years (OR = 1.717, 95% CI: 1.010–2.918; p = 0.046; Table 4) after adjusting for CKD.