Table 7: Relationship between ultrafiltration volume and participants' characteristics.

Variables

UFV

< 2L

N = 922 (%)

Mean ± SD

UFV

> 2L

N = 766 (%)

Mean ± SD

OR

95% CI

P-value

Sex

Males

Females

Age, years

< 65

> 65

Dialysis sessions/week

< 3

3

Erythropoietin 4000 IU

< 3/week             

3/week

BMI, kg/m2

< 25.0

> 25.0

Predialysis BP, mmHg

Systolic BP < 140

Systolic BP > 140

Diastolic BP < 90

Diastolic BP > 90

Predialysis haematocrit, %

< 33.0

> 33.0

Predialysis albumin, mg/L

< 35

> 35

Predialysis creatinine, umol/L

< 500

> 500

Predialysis bicarbonate, mmol/L

< 22

> 22

Dialysis duration, hours

< 4

4

Dialyzer surface area, m2

1.3/1.4

1.7/1.8

Blood flow rate, ml/min

< 350

> 350

Kt/V

< 1.2

> 1.2

URR, %

< 65

> 65

 

515 (45.8)

407 (72.2)

 

692 (50.3)

230 (74.0)

 

553 (42.5)

369 (95.3)

 

632 (47.4)

290 (81.9)

 

521 (65.9)

401 (44.7)

 

251 (75.6)

671 (49.5)

307 (93.0)

615 (45.3)

 

769 (51.9)

153 (74.6)

 

720 (53.5)

202 (69.6)

 

715 (73.3)

207 (29.1)

 

723 (49.5)

199 (87.3)

 

16 (29.6)

906 (54.8)

 

18 (75.0)

904 (54.3)

 

551 (72.3)

371 (40.1)

 

864 (61.4)

58 (20.7)

 

886 (63.2)

36 (12.5)

 

609 (54.2)

157 (27.8)

 

685 (49.7)

81 (26.0)

 

748 (57.5)

18 (4.7)

 

702 (52.6)

64 (18.1)

 

270 (34.1)

496 (55.3)

 

81 (24.4)

685 (50.5)

23 (7.0)

743 (54.7)

 

714 (48.1)

52 (25.4)

 

733 (46.5)

33 (30.4)

 

261 (26.7)

505 (70.9)

 

737 (50.5)

29 (12.7)

 

38 (70.4)

728 (45.2)

 

6 (25.0)

760 (45.7)

 

211 (27.7)

555 (59.9)

 

544 (38.6)

222 (79.3)

 

515 (36.8)

251 (87.5)

 

2.04

 

 

3.99

 

 

4.60

 

 

4.02

 

 

2.18

 

 

1.96

 

3.08

 

 

3.61

 

 

4.22

 

 

4.93

 

 

5.72

 

 

4.97

 

 

3.01

 

 

3.94

 

 

5.11

 

 

5.4

 

 

1.13-3.19

 

 

1.67-6.50

 

 

3.88-10.24

 

 

1.73-7.64

 

 

1.46-5.89

 

 

1.17-3.05

 

2.07-6.45

 

 

3.44-7.19

 

 

2.94-8.95

 

 

1.94-9.26

 

 

4.05-13.23

 

 

2.73-11.02

 

 

1.46-5.83

 

 

3.34-6.78

 

 

2.60-9.93

 

 

1.88-9.82

 

 

0.05

 

 

0.002

 

 

< 0.001

 

 

0.001

 

 

0.04

 

 

0.005

 

0.004

 

 

0.002

 

 

< 0.001

 

 

< 0.001

 

 

< 0.001

 

 

< 0.001

 

 

0.03

 

 

0.002

 

 

< 0.001

 

 

< 0.001

 

UFV: Ultrafiltration; OR: Odd Ratio; CI: Confidence Interval; BMI: Body Mass Index; BP: Blood Pressure; URR: Urea Reduction Ratio.