Although slightly less accurate than liver biopsy, simple noninvasive tests can reliably exclude advanced fibrosis in Chinese NAFLD patients in our center. FIB-4 index performs better than the other tests under examination.

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Owing to the completeness of concept lattice, construction efficiency is always a bottleneck restricting its next application. Starting with construction of concept lattice, the paper puts forward the idea of synonymous concept lattice. Applying the character of synonymous concept lattice, the paper promotes an algorithm that is vertical union of synonymous concept lattice (VUSCL Algorithm).The test results show that with the nodes increasing, the algorithm makes better improvement in time complexity than the other vertical union algorithm found in related literature.