Table 2 Results of PSM in the high-volume versus low-volume pre-OHDF groups divided by the median
From: Effects of Japanese-style online hemodiafiltration on survival and cardiovascular events
Item | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
Low volume | High volume | P-value | Low volume | High volume | P-value | |
Total (n) | 144 | 201 | 144 | 144 | ||
Sex, male/female (%) | 61.8/38.2 | 69.2/30.8 | 0.167 | 38.8/31.2 | 67.4/32.6 | 0.388 |
Underlying disease | 0.429 | 0.700 | ||||
Chronic nephropathy (%) | 34.7 | 35.8 | 37.5 | 36.1 | ||
Diabetic nephropathy (%) | 32.5 | 30.8 | 34.7 | 31.9 | ||
Nephrosclerosis (%) | 9.7 | 8.0 | 9.7 | 8.3 | ||
Other (%) | 18.1 | 25.4 | 18.1 | 23.6 | ||
Diabetes mellitus, yes/no (%) | 37.5/62.5 | 32.3/62.7 | 0.359 | 37.5/62.5 | 33.3/66.7 | 0.538 |
History of myocardial infarction, yes/no (%) | 1.4/98.6 | 2.5/97.5 | 0.704 | 1.4/98.6 | 2.8/97.2 | 0.684 |
History of intracerebral bleeding, yes/no (%) | 0.7/99.3 | 1.0/99.0 | > 0.999 | 0.7/99.3 | 0.7/99.3 | > 0.999 |
History of cerebral infarction, yes/no (%) | 4.2/95.8 | 2.5/97.5 | 0.536 | 4.2/95.8 | 2.8/97.2 | 0.750 |
History of quadruple amputation, yes/no (%) | 2.1/97.9 | 0.5/99.5 | 0.312 | 2.1/97.9 | 0.7/99.3 | 0.622 |
Use of antihypertensive agents, yes/no (%) | 37.5/62.5 | 37.3/62.7 | > 0.999 | 37.5/62.5 | 38.9/61.4 | 0.904 |
Age (years) | 66.1 ± 11.7 | 64.9 ± 11.8 | 0.316 | 66.1 ± 11.7 | 65.1 ± 10.9 | 0.266 |
Dialysis vintage (months) | 139.8 ± 124.2 | 148.4 ± 114.7 | 0.212 | 139.8 ± 124.2 | 157.8 ± 116.0 | 0.052 |
Blood flow rate (mL/min) | 277.9 ± 18.9 | 179.7 ± 20.2 | 0.155 | 270.0 ± 19.3 | 176.6 ± 19.7 | 0.136 |
Duration of dialysis session (h) | 4 ± 0 | 4 ± 0 | > 0.999 | 4 ± 0 | 4 ± 0 | > 0.999 |
Systolic BP, predialysis (mmHg) | 141 ± 25 | 145 ± 27 | 0.354 | 141 ± 25 | 143 ± 27 | 0.650 |
Diastolic BP, predialysis (mmHg) | 75 ± 14 | 78 ± 15 | 0.096 | 75 ± 14 | 77 ± 14 | 0.473 |
Body mass index (calculated as kg/m2) | 22.6 ± 3.9 | 22.8 ± 3.7 | 0.353 | 22.6 ± 3.9 | 22.7 ± 3.7 | 0.622 |
Albumin, predialysis (g/dL) | 3.4 ± 0.3 | 3.4 ± 0.3 | 0.681 | 3.4 ± 0.3 | 3.4 ± 0.3 | 0.910 |
High-sensitivity CRP, predialysis (g/dL) | 0.403 ± 1.109 | 0.403 ± 1.134 | 0.265 | 0.403 ± 1.109 | 0.360 ± 1.098 | 0.103 |
Corrected calcium, predialysis (m/dL) | 9.2 ± 0.7 | 9.2 ± 0.7 | 0.354 | 9.2 ± 0.7 | 9.2 ± 0.7 | 0.500 |
Phosphorus, predialysis (m/dL) | 5.6 ± 1.5 | 5.5 ± 1.3 | 0.768 | 5.6 ± 1.5 | 5.6 ± 1.3 | 0.787 |
Hemoglobin, predialysis (m/dL) | 11.2 ± 1.4 | 11.1 ± 1.2 | 0.324 | 11.2 ± 1.4 | 11.0 ± 1.2 | 0.128 |
Ferritin (ng/mL) | 68.1 ± 77.1 | 81.2 ± 181.8 | 0.462 | 76.6 ± 96.3 | 75.3 ± 157.7 | 0.650 |
Kt/V | 1.6 ± 0.3 | 1.5 ± 0.3 | < 0.05 | 1.6 ± 0.3 | 1.5 ± 0.3 | 0.069 |
Creatinine, predialysis (mg/dL) | 10.86 ± 2.95 | 11.46 ± 2.78 | < 0.05 | 10.86 ± 2.96 | 11.29 ± 2.80 | 0.143 |
Blood urea nitrogen, predialysis (mg/dL) | 58.5 ± 15.3 | 59.4 ± 14.3 | 0.303 | 58.5 ± 15.3 | 59.4 ± 13.8 | 0.334 |