The study cohort showed improvement of preoperative pathologic liver histology findings after operative procedures took place. Both surgery methods improved the NAFLD activity score significantly, all improvement −2.0 (confidence interval −2.5 to −1.0; P < .001); Roux-en-Y gastric bypass, improvement −1.0 (confidence interval −2.0 to −.0; P = .038); sleeve gastrectomy, improvement −2.5 (confidence interval −3.5 to −1.5; P < .001). No differences were found with regard to histologic recovery between gastric bypass and sleeve gastrectomy (P = .22).

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