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Theophylline was higher in subjects with NAFLD and fibrosis. Theophylline fraction of total caffeine metabolites and categories of the fatty liver index (FLI) (a) and scores of fibrosis (b) and steatosis (c). * = significant difference (p ≤ 0.05, Mann–Whitney test); **** = significant difference (p ≤ 0.0001, Mann–Whitney test).
