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Table 2 Comparison of the matched derivation and validation cohorts

From: Temporal validation of the CT-PIRP prognostic model for mortality and renal replacement therapy initiation in chronic kidney disease patients

   Nodes
All nodes 1 2 3 4 5 6 7
N (%) D 2051 (100.0) 217 (10.6) 347 (16.9) 98 (4.8) 220 (10.7) 75 (3.7) 388 (18.9) 706 (34.4)
V 2051 (100.0) 217 (10.6) 347 (16.9) 98 (4.8) 220 (10.7) 75 (3.7) 388 (18.9) 706 (34.4)
eGFR change D −1.22;4.22 −2.27;5.19 −1.49;4.11 −3.25;4.72 −1.32;4.56 −1.79;5.31 −0.58;4.31 −0.86;4.15
(median; IQR) V −1.11;4.41 − 3.43;5.86 −2.09;4.27 − 2.00;4.94 − 0.76;4.04 − 1.11;5.17 −0.37;4.26 − 0.61;3.73
M-W test 0.7, p = .482 1.8, p = .080 1.8, p = .072 −1.2, p = .238 −1.8, p = .072 −2.1, p = .040 −0.5, p = .647 −0.8, p = .414
baseline eGFR D 27.1;16.1 42.7;13.9 23.3;10.4 17.5;10.4 31.3;23.1 30.6;16.9 24.2;11.6 28.0;15.5
(median; IQR) V 29.6;18.7 45.5;15.1 23.1;9.6 17.5;10.4 39.3;24.0 38.2;21.7 25.4;14.1 31.8;16.6
M-W test −6.0, p < .001 −2.2, p = .030 0.7, p = .490 −0.1, p = .922 −4.2, p < .001 −3.1, p = .002 −2.3, p = .023 −5.4, p < .001
PO4 D 3.70;0.90 3.50;0.90 3.70;0.70 4.90;0.80 3.70;1.00 4.00;1.00 3.90;0.75 3.50;0.90
(median; IQR) V 3.50;0.90 3.40;0.90 3.60;0.70 4.80;0.60 3.40;0.95 3.70;0.70 3.70;0.80 3.30;0.80
M-W test 7.5, p < .001 1.6, p = .111 2.9, p = .004 1.2, p = .223 3.6, p = <.001 2.7, p = .008 4.6, p < .001 4.7, p < .001
Age D 74.0;14.0 67.0;16.9 72.9;14.9 66.5;19.9 58.6;16.1 63.5;7.7 78.5;9.4 78.3;9.0
(median; IQR) V 74.8;13.0 68.5;16.4 75.0;13.2 72.8;16.8 59.9;15.4 63.0;8.9 78.5;8.9 77.5;8.7
M-W test −1.7, p = .085 −1.5, p = .137 −2.3, p = .019 −2.0, p = .043 −1.3, p = .182 1.0, p = .297 −1.0, p = .300 1.2, p = .238
Diabetes D 668 (32.6) 98 (45.2) 129 (37.2) 48 (48.9) 0 (0) 73 (100.0) 110 (28.3) 208 (29.5)
n(%) V 782 (38.1) 118 (54.4) 164 (47.0) 47 (48.0) 0 (0) 73 (100.0) 144 (37.1) 235 (33.3)
χ2 test 13.9, p = <.001 3.7, p = .055 6.8, p = .009 0.02, p = .886 6.8, p = .009 2.4, p = .121
Male gender D 1340 (65.3) 161 (74.2) 235 (67.7) 49 (50.0) 139 (63.2) 50 (66.7) 0 (0) 694 (100.0)
n(%) V 1372 (66.9) 170 (78.3) 246 (70.9) 47 (48.0) 147 (66.8) 56 (74.7) 0 (0) 694 (100.0)
χ2 test 1.1, p = .291 1.0, p = .310 0.8, p = .365 0.1, p = .775 0.6, p = .424 1.2, p = .282
  1. Abbreviations: D = derivation cohort; V = validation cohort; M-W test = Mann-Whitney test
  2. Missing data were found only in the serum phosphate variable (19.4% in the derivation cohort, 19.8% in the validation cohort)