Aims: To evaluate the diagnostic performance of ultrasound-derived fat fraction (UDFF) in assessing the degree of hepatic steatosis in an obese population, with liver biopsy as reference standard.

Materials and methods: Obese individuals, who were found to have fatty liver by B-mode ultrasound and underwent UDFF measurement, along with liver biopsy results, were retrospectively selected from The First Affiliated Hospital of Shandong First Medical University.The inclusion criteria were as follows: (1) BMI over 30 kg/m²; (2) diffuse fatty liver or inhomogeneous fatty liver diagnosed by conventional B-mode ultrasound; (3) serologic test results were available. The exclusion criteria include: (1) patients who have undergone liver resection or have liver space-occupying lesions; (2) pregnant women; (3) patients with incomplete medical history data.

Inclusion Criteria:

• BMI over 30 kg/m²
• diffuse fatty liver or inhomogeneous fatty liver diagnosed by conventional B-mode ultrasound
• serologic test results were available

Exclusion Criteria:

• patients who have undergone liver resection or have liver space-occupying lesions
• pregnant women
• patients with incomplete medical history data

Obese individuals, who were found to have fatty liver by B-mode ultrasound and underwent UDFF measurement, along with liver biopsy results, were retrospectively selected from The First Affiliated Hospital of Shandong First Medical University

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