Table 1 Characteristics of CAPD patients stratified by serum phosphorus time in range in the first PD year

No. of participants

1915

319

884

712

Age, years

46.7 ± 13.7

45.8 ± 13.8

46.8 ± 13.9

47.1 ± 13.5

0.399

Male, n (%)

1029 (53.7)

182 (57.1)

485 (54.9)

362 (50.8)

0.119

BMI, kg/m²

21.8 ± 3.2

22.4 ± 3.5

21.8 ± 3.1

21.6 ± 3.2

< 0.001

Smoking, n (%)

306 (16.0)

60 (18.8)

142 (16.1)

104 (14.6)

0.234

Alcohol drinking, n (%)

164 (8.6)

26 (8.2)

79 (8.9)

59 (8.3)

0.862

Diabetes, n (%)

302 (15.8)

52 (16.4

139 (15.8)

111 (15.6)

0.951

PD vintage, months

28 (12–47)

29 (10–46)

28 (11–46)

27 (13–49)

0.639

BP at baseline, mmHg

 SBP

141.7 ± 21.2

144.2 ± 21.9

141.1 ± 21.8

141.4 ± 20.1

0.088

 DBP

85.9 ± 12.7

87.2 ± 13.6

85.6 ± 12.8

85.8 ± 12.3

0.156

Baseline laboratory results

 Blood HGB, g/L

82.9 ± 19.1

81.2 ± 19.6

82.1 ± 18.8

84.6 ± 19.2

0.011

 Serum creatinine, µmol/L

981.4 ± 358.5

1027.9 ± 402.0

994.4 ± 363.7

945.6 ± 328.2

0.001

 Serum albumin, g/L

36.4 ± 5.4

35.4 ± 5.5

36.2 ± 5.4

37.1 ± 5.3

< 0.001

 Serum phosphorus, mmol/L

2.1 ± 0.7

2.2 ± 0.7

2.1 ± 0.7

2.0 ± 0.6

0.002

 Serum calcium, mmol/L

2.0 ± 0.3

2.0 ± 0.3

2.0 ± 0.3

2.0 ± 0.3

0.141

 LN of iPTH, pg/ml

5.5 ± 1.1

5.5 ± 1.1

5.5 ± 1.1

5.4 ± 1.1

0.080

 Serum potassium, mmol/L

4.6 ± 0.8

4.6 ± 0.8

4.6 ± 0.8

4.6 ± 0.8

0.813

 Fasting glucose, mmol/L

5.7 ± 2.0

5.5 ± 1.7

5.7 ± 2.0

5.7 ± 2.2

0.660

Baseline PD characteristics

 Dialysate GLUC, %

1.5 ± 0.1

1.6 ± 0.2

1.5 ± 0.2

1.5 ± 0.1

0.084

 UF volume, ml/24 h

310 (200–500)

350 (250–530)

350 (200–500)

300 (150–500)

0.002

 Urine volume, ml/24 h

1000 (600–1200)

800 (500–1100)

1000 (600–1200)

1000 (694–1250)

< 0.001

Mean values of total Kt/V score ^b

2.2 ± 0.6

2.1 ± 0.7

2.2 ± 0.6

2.3 ± 0.6

< 0.001

Medication use, n (%)

 Phosphate-binding

1223 (64.0)

215 (67.6)

576 (65.3)

432 (60.7)

0.053

 RASi (ACEI or ARB)

1476 (77.2)

231 (72.6)

670 (75.9)

575 (80.9)

0.006