| | Group 2 HD/week | Group 3 HD/week | |
| | 70 (52%) | 64 (48%) | | Age (years) | 62,2 ± 15,1 | 62,6 ± 11,9 | = 0,847 | Male gender | 49 (70%) | 50 (78%) | = 0,382 | Primary renal diagnosis: | | | | Glomerulonephritis | 12 (17,1%) | 8 (12,5%) | = 0,296 | Renal vascular disease | 8 (11,4%) | 10 (15,6%) | Interstitial nephropathy | 14 (20%) | 10 (15,6%) | Diabetic nephropathy | 14 (20%) | 13 (20,3%) | Polycystic kidney disease | 7 (10%) | 6 (9,4%) | Other | 10 (14,3%) | 10 (15,6%) | Unknown | 5 (7,1%) | 7 (10,9%) | Kidney transplant failure | 11 (16%) | 15 (23%) | = 0,362 | Body mass index (kg/m2) | 25,9 ± 5,1 | 25 ± 4,8 | = 0,294 | Charlson index | 6,2 ± 2,7 | 6,6 ± 2,5 | = 0,362 | Arteriovenous fistula as initial vascular access | 41 (59%) | 33 (51%) | = 0,461 | Daily urinary volume (mL) | 1618 ± 832 | 1153 ± 676 | < 0,001 | GFR (mL/min/1,73 m2) | 6,35 ± 2,35 | 5,22 ± 2,74 | = 0,010 |
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