Table 3.
Correlation coefficient (r), mean, bias, precision, and accuracy for CGBSA, 4-MDRD, CKD-EPIcr, and CKD-EPIcys equations.
| Correlation coefficient (r) |
Mean GFR (ml/min/1.73 m2) |
Range (IQR) | Mean difference (bias) |
SD of mean bias (precision) |
Accuracy within 30% |
||
|---|---|---|---|---|---|---|---|
| Lower | Upper | ||||||
| Measured GFR | 41.2 | 17.7 | 98.3 | ||||
| CGBSA | 0.861∗ | 33.2 | 15.4 | 65.6 | −7.97 | 10.68 | 85 |
| 4-MDRD | 0.889∗ | 38.4 | 14.0 | 86.0 | −2.76 | 8.70 | 90 |
| CKD-EPIcr | 0.902∗ | 38.1 | 14.0 | 85.0 | −3.09 | 8.18 | 95 |
| CKD-EPIcys | 0.928∗ | 46.1 | 16.0 | 108.0 | 4.90 | 8.26 | 81 |
∗Significantly correlates with P < 0.001 (bias: mean difference of estimated GFR and measured GFR; accuracy: n percentage of GFR estimates within n% of measured GFR; IQR: interquartile range).