Table 1.

Characteristics of CKD patients included in our registry (stratified by CKD stage on the date of CKD confirmation)

Stage 3 (n = 48,195)Stage 4 (n = 3804)Stage 5 (n = 1400)ICD-9 Code Diagnosis Only (n = 3877)Combined (n = 57,276)
Age [mean (SD)]70.4 (12.5)70.8 (14.1)62.2 (14.8)59.5 (17.0)69.5 (13.4)
Years in registry [mean (SD)]2.9 (1.4)3.3 (1.5)2.8 (1.7)2.1 (1.8)2.8 (1.5)
Gender [n (%)]
    female27,161 (56.4)2,091 (55.0)668 (47.7)1,694 (43.7)31,614 (55.2)
    male21,034 (43.6)1,713 (45.0)732 (52.3)2,183 (56.3)25,662 (44.8)
Ethnic group [n (%)]
    missing409 (0.8)40 (1.1)14 (1.0)150 (3.9)613 (1.1)
    white41,903 (86.9)3,036 (79.8)792 (56.6)2,640 (68.1)48,371 (84.5)
    African American4,791 (9.9)635 (16.7)545 (38.9)939 (24.2)6,910 (12.1)
    Hispanic/Latino414 (0.9)35 (0.9)31 (2.2)74 (1.9)554 (1.0)
    Asian/Pacific Island200 (0.4)18 (0.5)7 (0.5)30 (0.8)255 (0.4)
    other478 (1.0)40 (1.1)11 (0.8)44 (1.1)573 (1.0)
Insurance group [n (%)]
    missing1,073 (2.2)103 (2.7)66 (4.7)197 (5.1)1,439 (2.5)
    Medicare25,710 (53.3)2,316 (60.9)902 (64.4)1,666 (43.0)30,594 (53.4)
    Medicaid826 (1.7)119 (3.1)73 (5.2)192 (5.0)1,210 (2.1)
    others20,586 (42.7)1,266 (33.3)359 (25.6)1,822 (47.0)24,033 (42.0)
Comorbidities at inclusion [n (%)]
    diabetes9,510 (19.7)915 (24.1)350 (25.0)1,595 (41.1)12,370 (21.6)
    hypertension39,336 (81.6)2,862 (75.2)980 (70.0)3,039 (78.4)46,217 (80.7)
    coronary artery disease8,802 (18.3)740 (19.5)185 (13.2)579 (14.9)10,306 (18.0)
    congestive heart failure3,261 (6.8)413 (10.9)109 (7.8)330 (8.5)4,113 (7.2)
    hyperlipidemia36,188 (75.1)2,609 (68.6)846 (60.4)2,691 (69.4)42,334 (73.9)
Cerebrovascular disease3,693 (7.7)332 (8.7)84 (6.0)209 (5.4)4,318 (7.5)
  • Stage 3 CKD, GFR 30 to 59 ml/min per 1.73 m2; stage 4 CKD, GFR 15 to 29 ml/min per 1.73 m2; stage 5 CKD, GFR <15 ml/min per 1.73 m2; SD, standard deviation.