Table 1 Baseline characteristics of patients wtih non-dialysis CKD stratified by serum phosphorus levels
Variables a | Serum phosphorus, mg/dL | P value | ||
|---|---|---|---|---|
< 3.5 ( n = 2395) | 3.5 to < 4.5 ( n = 4564) | ≥ 4.5 ( n = 735) | ||
Age, yr | 0.083 | |||
18–65 | 1010(50.7) | 1929(48.0) | 358(52.7) | |
≥ 65 | 1385(49.3) | 2635(52.0) | 377(47.3) | |
Male, n (%) | 1432(56.5) | 1938(37.5) | 241(29.7) | 0.053 |
Race, n (%) | 0.016 | |||
non-Hispanic White | 1107(67.7) | 2368(71.9) | 371(71.1) | |
non-Hispanic Black | 570(13.2) | 927(11.3) | 146(10.5) | |
Mexican American | 376(8.0) | 592(6.2) | 108(6.8) | |
Other | 342(11.1) | 677(10.6) | 110(11.6) | |
CKD stages | < 0.001 | |||
G1-2 | 1353(58.6) | 2241(50.4) | 318(44.4) | |
G3a | 740(30.9) | 1533(34.8) | 218(32.0) | |
G3b | 253( 8.8) | 597(11.7) | 111(14.5) | |
G4 | 45(1.7) | 183(3.0) | 60(6.5) | |
G5 | 4(0.1) | 10(0.1) | 28(2.7) | |
Hemoglobin, g/dL | 14.2(0.0) | 13.8(0.0) | 13.5(0.1) | < 0.001 |
Serum albumin, g/L | 41.4(0.1) | 41.6(0.1) | 41.6(0.2) | 0.152 |
Serum calcium, mmol/L | 2.3(0.0) | 2.4(0.0) | 2.4(0.0) | < 0.001 |
Parathyroid hormoneb, pg/mL | 60.7(2.5) | 53.3(1.3) | 62.5(6.5) | 0.023 |
25(OH) D, nmol/L | 68.1(1.0) | 70.6(0.8) | 70.1(1.5) | 0.054 |
Obesityc, n (%) | 1080(47.4) | 1910(42.3) | 300(41.3) | 0.004 |
Hypertension, n (%) | 1716(68.2) | 3247(66.1) | 514(66.2) | 0.432 |
Diabetes, n (%) | 982(36.6) | 1689(31.7) | 300(34.2) | 0.005 |
CVD, n (%) | 658(24.0) | 1260(24.2) | 209(27.3) | 0.317 |