Table 2.

Agreement between CKDEPI and CKDCYS stages

eGFREPI (ml/min per 1.73 m2)eGFRCYS3var (ml/min per 1.73 m2) (n) (%)aTotal patients (n) (%)eGFRCYS1var (ml/min per 1.73 m2) (n) (%)bTotal patients (n) (%)
eGFR >60eGFR 30 to 59eGFR <30eGFR >60eGFR 30 to 59eGFR <30
eGFR >60416 (40.5)85 (8.3)0501 (48.7)465 (45.2)36 (3.5)0501 (48.7)
eGFR 30 to 59138 (13.4)328 (31.9)11 (1.1)477 (46.4)224 (21.8)248 (24.1)5 (0.5)477 (46.4)
eGFR <30020 (2.0)30 (2.9)50 (4.9)028 (2.7)22 (2.1)50 (4.9)
Total554 (53.9)433 (42.1)41 (4.0)1028 (100)689 (67.0)312 (30.4)27 (2.6)1028 (100)
• The cell percentages may not total to margin percentages because of rounding. Cells with bold type represent agreement. Cells above the cells with bold represent disagreements in which estimated GFR category was higher with the CKD-Epi equation than with the cystatin C equation; cells below the cells with bold represent disagreements in which estimated GFR category was lower with the CKD-Epi equation than with the cystatin C equation. Parentheses = percentages of total participants (n = 1028). To calculate the percentage of agreement in a particular row, divide the value in bold into the total in that row. To calculate the percentage of agreement in a particular column, divide the value in bold into the total in that column. For example, in patients with eGFR using CKDEPI of <30 ml/min per 1.73 m2, the percentage of agreement in rows = 30/50 and percentage of agreement in columns = 30/41.

• a Weighted kappa statistics: 0.58 (95% CI, 0.53 to 0.62).

• b Weighted kappa statistics: 0.51 (95% CI, 0.46 to 0.55).