Table 1 Baseline characteristics
|  | All Patients | Patients younger than 60 years old | Patients older than 70 years old | ||||||
|---|---|---|---|---|---|---|---|---|---|
PD Group (n = 501) | HD Group (n = 436) | p | PD Group (n = 352) | HD Group (n = 233) | p | PD Group (n = 48) | HD Group (n = 92) | p | |
Demographic data | |||||||||
 Female(n) | 210(41.92%) | 201(46.10%) | 0.22 | 151 (42.90%) | 90 (38.63%) | 0.35 | 19 (39.58%) | 57 (61.96%) | 0.02 |
 Age at dialysis initiation (years) | 51.69 ± 14.47 | 57.11 ± 15.92 | 0.00 | 44.55 ± 10.58 | 45.26 ± 11.29 | 0.44 | 75.77 ± 3.66 | 77.49 ± 4.49 | 0.02 |
 Body mass index | 22.60 ± 3.91 | 23.13 ± 4.30 | 0.05 | 22.34 ± 3.55 | 23.01 ± 4.60 | 0.06 | 22.75 ± 3.07 | 23.27 ± 4.13 | 0.40 |
 Duration of follow up (months) | 31.68 ± 18.71 | 36.98 ± 21.26 | 0.00 | 32.80 ± 19.44 | 38.28 ± 22.14 | 0.00 | 26.16 ± 15.48 | 34.86 ± 19.30 | 0.00 |
Kidney primary disease | |||||||||
 Diabetic nephropathy(n) | 138 (27.54%) | 116 (26.61%) | 0.80 | 81 (23.01%) | 57 (24.46%) | 0.76 | 21 (43.75%) | 26 (28.26%) | 0.10 |
 Glomerulus nephritis(n) | 255 (50.90%) | 136 (31.19%) | 0.00 | 198 (56.25%) | 100 (42.92%) | 0.00 | 10 (20.83%) | 15 (16.30%) | 0.67 |
 Polycystic kidney(n) | 3 (0.60%) | 21 (4.82%) | 0.00 | 0 (0.00%) | 14 (6.01%) | 0.00 | 1 (2.08%) | 0 (0.00%) | 0.74 |
 Obstructive nephropathy(n) | 36 (7.19%) | 21 (4.82%) | 0.17 | 23 (6.53%) | 9 (3.86%) | 0.23 | 6 (12.50%) | 3 (3.26%) | 0.08 |
 Other or unknow(n) | 69 (13.77%) | 142 (32.57%) | 0.00 | 50 (14.20%) | 53 (22.75%) | 0.01 | 10 (20.83%) | 48 (52.17%) | 0.00 |
Comorbidities | |||||||||
 Charlson Comorbidities Index (CCI) | 5.07 ± 2.25 | 5.87 ± 2.47 | 0.00 | 4.11 ± 1.69 | 4.36 ± 1.96 | 0.10 | 8.50 ± 1.49 | 8.41 ± 1.45 | 0.74 |
 Diabetes(n) | 164 (32.73%) | 170 (38.99%) | 0.05 | 92 (26.14%) | 73 (31.33%) | 0.20 | 26 (54.17%) | 49 (53.26%) | 0.94 |
 Cardiovascular disease(n) | 62 (12.38%) | 64 (14.68%) | 0.35 | 24 (6.82%) | 18 (7.73%) | 0.80 | 16 (33.33%) | 27 (29.35%) | 0.77 |
 Congestive heart failure(n) | 120 (23.95%) | 155 (35.55%) | 0.00 | 81 (23.01%) | 63 (27.04%) | 0.31 | 21 (43.75%) | 46 (50.00%) | 0.60 |
 Cerebrovascular disease(n) | 54 (10.78%) | 88 (20.18%) | 0.00 | 16 (4.55%) | 30 (12.88%) | 0.00 | 15 (31.25%) | 36 (39.13%) | 0.46 |
 Chronic pulmonary disease(n) | 30 (5.99%) | 32 (7.34%) | 0.48 | 16 (4.55%) | 13 (5.58%) | 0.71 | 8 (16.67%) | 12 (13.04%) | 0.74 |
Laboratory tests | |||||||||
 Serum Urea (mmol/l) | 25.35 ± 11.77 | 22.26 ± 11.31 | 0.00 | 26.09 ± 12.32 | 22.65 ± 11.56 | 0.00 | 23.33 ± 9.84 | 19.12 ± 9.04 | 0.01 |
 Serum creatinine (umol/l) | 860.59 ± 283.38 | 745.81 ± 319.76 | 0.00 | 899.14 ± 283.23 | 804.08 ± 332.03 | 0.00 | 715.11 ± 214.78 | 582.44 ± 268.22 | 0.00 |
 Triglyceride (mmol/L) | 1.34 ± 0.79 | 1.43 ± 1.04 | 0.15 | 1.34 ± 0.74 | 1.40 ± 0.80 | 0.36 | 1.12 ± 0.70 | 1.35 ± 0.79 | 0.09 |
 Cholesterol (mmol/L) | 4.54 ± 1.35 | 4.45 ± 1.28 | 0.31 | 4.59 ± 1.40 | 4.42 ± 1.26 | 0.15 | 4.37 ± 1.35 | 4.39 ± 1.08 | 0.93 |
 Plasma albumin(g/L) | 34.87 ± 5.13 | 35.45 ± 5.57 | 0.10 | 34.99 ± 5.24 | 35.83 ± 5.97 | 0.08 | 34.09 ± 4.90 | 35.89 ± 4.43 | 0.03 |
 Prealbumin(g/L) | 316.75 ± 85.99 | 278.91 ± 91.84 | 0.00 | 329.16 ± 84.76 | 295.88 ± 97.73 | 0.00 | 242.97 ± 73.70 | 252.48 ± 76.24 | 0.48 |
 Hemoglobin(g/L) | 82.36 ± 18.67 | 86.66 ± 20.85 | 0.00 | 81.52 ± 18.63 | 87.30 ± 21.23 | 0.00 | 83.42 ± 19.30 | 87.00 ± 21.52 | 0.33 |