| | Variables | Low SMI, n = 19 | Normal SMI, n = 186 | Value |
| | Basic Indicators | | | | | Age, yr, median (IQR) | 56 (34, 71) | 56.5 (46, 67) | 0.636 | | Male, n (%) | 3 (15.8%) | 124 (66.7%) | <0.001 | | Body mass index, kg/m2, mean ± SD | 20.17 ± 3.24 | 25.42 ± 3.86 | <0.001 | | CKD etiology, n (%) | | | 0.080 | | Diabetic nephropathy | 3 (15.8%) | 60 (32.3%) | | | Hypertensive nephropathy | 1 (5.3%) | 27 (14.5%) | | | Glomerulonephropathy | 4 (21.1%) | 47 (25.3%) | | | Others | 3 (15.8%) | 19 (10.2%) | | | Unknown | 8 (42.1%) | 33 (17.7%) | | | CKD stage, n (%) | | | 0.037 | | 1 + 2 | 1 (5.3%） | 24 (12.9%) | | | 3 + 4 | 3 (15.8%) | 75 (40.3%) | | | 5A | 3 (15.8%) | 28 (15.1%) | | | 5B | 12 (63.2%) | 59 (31.7%) | | | Parathyroid hormone, pg/ml, median (IQR) | 250.4 (110.4, 773.1) | 95.45 (47.35, 441.03) | 0.056 | | Parathyroid hormone>88mmol/L | 16 (84.2%) | 104 (55.9%) | 0.017 | | Hemoglobin, g/L, mean ± SD | 107 ± 18.72 | 109.84 ± 23.49 | 0.611 | | Albumin, g/L, median (IQR) | 39.7 (34.8, 44.9) | 39.7 (35.03, 43.5) | 0.836 | | Total cholesterol, mmol/L, median (IQR) | 4.26 (3.55, 5.14) | 4.14 (3.35, 4.84) | 0.418 | | Triglyceride, mmol/L, median (IQR) | 1.46 (0.99, 2.22) | 1.71 (1.17, 2.44) | 0.626 | | Phosphorus, mmol/L, median (IQR) | 1.28 (1.08, 1.94) | 1.36 (1.12, 1.86) | 0.863 | | Calcium, mmol/L, median (IQR) | 2.19 (2.12, 2.55) | 2.18 (2.07, 2.35) | 0.326 | | Total Nutrition Indicators | | | | | PA, °, median (IQR) | 4.2 (3.4, 4.7) | 5.2 (4.38, 5.9) | <0.001 | | Low PA, n (%) | 14 (73.7%) | 56 (30.1%) | <0.001 | | Body cell mass, kg, mean ± SD | 22.43 ± 1.76 | 32.76 ± 6.61 | <0.001 | | Protein, kg, median (IQR) | 6.9 (6.3, 7.1) | 9.85 (8.2, 10.95) | <0.001 | | Basal metabolic rate, kcal, median (IQR) | 1134 (1086, 1177) | 1463 (1285.75, 1575.75) | <0.001 | | Fat Indicators | | | | | Percent body fat, %, mean ± SD | 28.37 ± 10.12 | 27.68 ± 8.68 | 0.745 | | Visceral fat area, cm2, median (IQR) | 68.7 (49, 122.1) | 84.5 (67.7, 114.18) | 0.105 | | Body fat mass, kg, mean ± SD | 14.93 ± 7.69 | 19.83 ± 8.14 | 0.013 | | Muscle Indicators | | | | | Fat free mass, kg, median (IQR) | 35.4 (33.2, 37.4) | 50.6 (42.4, 55.83) | <0.001 | | Soft lean mass, kg, median (IQR) | 33.1 (31.2, 35) | 47.85 (39.98, 52.65) | <0.001 | | Skeletal muscle mass, kg, median (IQR) | 18.6 (17.1, 19.6) | 27.6 (22.8, 31.18) | <0.001 | | SMI, kg/m2, median (IQR) | 5.4 (5, 5.6) | 7.6 (6.7, 8.3) | <0.001 |
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