Fig. 1

Comparison of steatosis groups using controlled attenuation parameter (CAP) value. (A and B) CAP values in each steatosis group based on MR proton density fat fraction (PDFF) of whole group (a) and divided by gender (b) are demonstrated in a box plot. Hepatic steatosis grades 0–3 (S0-S3) were classified using the PDFF cutoff values of 6, 17.5, and 23.3%. The mean and median CAP values were 228.4 and 222.5 dB/m in S0, 309 and 308 dB/m in S1, 313.2 and 301 dB/m in S2, and 332.7 and 329 dB/m in S3, respectively. The dash line means the cutoff value of 241 dB/m to differentiate S0 vs. S1-S3. (c) On receiver operating characteristic curve analysis, the optimal cutoff value for diagnosis of S1-S3 vs. S0 was 241 dB/m with 98.7% sensitivity (95% confidence interval [CI], 92.9–100.0), 80.0% specificity (95% CI, 44.4–97.5), and 0.941 of area under the curve (95% CI, 0.868–0.980)