Table 2. The characteristics of development and validation sets.

Variable	Development set (n = 210)	Validation set (n = 159)	p-value
Gender			0.323
Female	106 (50.5)	72 (45.3)
Male	104 (49.5)	87 (54.7)
PEW	106 (50.5)	78 (49.1)	0.787
Age, year	57.34 $\pm$ 11.08	57.57 $\pm$ 11.92	0.853
Age > 65	61 (29)	46 (28.9)	0.980
Dialysis duration (month)	22 (9, 51)	18 (10, 48)	0.451
Infection	23 (11)	12 (7.5)	0.269
Peritonitis	16 (7.6)	9 (5.7)	0.458
Peritonitis occurrence	0 (0, 0)	0 (0, 0)	0.880
Hypertension	139 (66.2)	97 (61)	0.304
Cardiovascular disease	2 (1.0)	0 (0)	0.217
Diabetes	30 (14.3)	20 (12.6)	0.635
BUN (mmol/L)	20.69 $\pm$ 9.72	20.15 $\pm$ 6.55	0.547
Predialysis BUN (mmol/L)	28.55 (22.38, 36.63)	28.6 (23.3, 34.1)	0.567
Serum creatinine (μmol/L)	955.62 $\pm$ 286.95	929.57 $\pm$ 280.92	0.384
Serum potassium (mmol/L)	4.10 $\pm$ 0.64	4.06 $\pm$ 0.72	0.595
Serum sodium (mmol/L)	140.08 $\pm$ 2.47	139.96 $\pm$ 2.74	0.652
Serum calcium (mmol/L)	2.27 $\pm$ 0.25	2.26 $\pm$ 0.16	0.493
Serum phosphorus (mmol/L)	1.56 $\pm$ 0.42	1.52 $\pm$ 0.40	0.414
CRP (mg/L)	2 (1, 4)	2 (1, 5)	0.828
Glucose (mmol/L)	6.43 $\pm$ 2.61	6.25 $\pm$ 2.17	0.490
TG (mmol/L)	1.53 (1.09, 2.33)	1.54 (1.09, 2.21)	0.667
LDL (mmol/L)	2.92 $\pm$ 2.93	2.67 $\pm$ 0.90	0.304
PTH (pg/mL)	271.8 (143.75, 445.78)	278 (132.3, 461.1)	0.859
RAASi	98 (46.7)	83 (52.2)	0.292
Ultrafiltration volume (L)	350 (150, 720)	350 (110, 780)	0.872
Ccr (umol/L)	61.29 $\pm$ 19.21	61.65 $\pm$ 20.16	0.860
Kt/V (ml/s/1.73 m2)	1.99 (1.74, 2.30)	1.94 (1.77, 2.23)	0.453

Notes:

BUN, blood urea nitrogen; CRP, C-reactive protein; TG, triglyceride; LDL, low-density lipoprotein; PTH, parathyroid hormone; RAASi, renin-angiotensin-aldosterone system inhibitors; Ccr, creatinine clearance rate; Kt/V, urea clearance index; PEW, protein energy wasting.

Categorical variables are showed as n (%). Continuous variables with normal distribution are reported as mean $\pm$ SD. Continuous variables with abnormal distribution are given as median (IQR).