Table 4. The prevalence of different thyroidism in each CKD stage.

CKD stages N = 581	Normal TH N = 210 (36.2%)	Hyperthyroidism N = 14 (2.4%)	Hypothyroidism N = 128 (22%)	Euthyroid Sick Syndrome N = 229 (39.4%)
1N = 287	101 (35.2%)	7 (2.4%)	59 (46.1%)	120 (41.8%)
2N = 122	45 (36.9%)	3 (2.5%)	27 (22.1%)	47 (38.5%)
3N = 108	46 (42.6%)	1 (0.9%)	28 (25.9%)	33 (30.6%)
4N = 46	12 (26.1%)	2 (4.3%)	12 (26.1%)	20 (43.5%)
5N = 18	6 (33.3%)	1 (5.6%)	2 (11.1%)	9 (50.0%)

Clinical and subclinical categories of hypo-/hyperthyroidism were collapsed. CKD stage 1: eGFR ≥ 90 ml/min; CKD stage 2: 90 ml/min > eGFR ≥ 60 ml/min; CKD stage 3: 30 ml/min > eGFR ≥ 60 ml/min; CKD stage 4: 15 ml/min > eGFR ≥ 30 ml/min; CKD stage 5: eGFR < 15 ml/min; TH: thyroid hormone (χ² = 34.89, P = 0.004 by chi-square test).