Table 3.
Intra-observer agreement on the measurement of imaging parameters.
| Parameters | Groups | Observer 1 | Observer 2 | ICC values |
|---|---|---|---|---|
| Cortex FF values (%) | Group A (n = 18) | 1.13 (0.61, 1.58) | 1.06 (0.70, 1.65) | 0.915 |
| Group B (n = 17) | 1.72 (1.31, 2.61) | 1.60 (1.31, 2.49) | 0.997 | |
| Group C (n = 22) | 1.19 (0.90, 2.01) | 1.23 (0.79, 2.14) | 0.987 | |
| medulla FF values (%) | Group A (n = 18) | 0.90 (0.63, 1.73) | 1.22 (0.90, 2.39) | 0.854 |
| Group B (n = 17) | 1.71 (0.87, 4.26) | 2.56 (1.50, 3.78) | 0.942 | |
| Group C (n = 22) | 1.28 (0.65, 2.02) | 1.42 (1.07, 2.72) | 0.821 | |
| cortex R2* values (/s) | Group A (n = 18) | 17.23 (16.14, 19.02) | 18.21 (16.37, 19.59) | 0.763 |
| Group B (n = 17) | 18.81 (16.55, 20.05) | 19.31 (17.80, 20.05) | 0.954 | |
| Group C (n = 22) | 15.38 (14.45, 16.92) | 17.04 (14.69, 18.14) | 0.857 | |
| medulla R2* values (/s) | Group A (n = 18) | 21.60 (19.28, 23.53) | 21.69 (17.48, 26.59) | 0.860 |
| Group B (n = 17) | 21.34 (17.60, 22.80) | 21.56 (17.48, 23.62) | 0.972 | |
| Group C (n = 22) | 19.82 (19.01, 20.73) | 22.52 (19.46, 23.42) | 0.759 |
Observer 1 and 2, two radiologists with 8 years and 2 years of experiences in abdominal imaging; ICC, intra-class correlation; ICC values lower than 0.40, between 0.40 and 0.75 and greater than 0.75 were considered to have low, medium, and high consistency, respectively; Group A, mild renal damage group; group B, moderate to severe renal damage group; group C, healthy control group; FF, fat fraction; R2*, transverse relaxation rate.