What is the substantial evidence required to overturn a jury's verdict in a personal injury case?

In applying the substantial evidence standard of review, the appellate court adopts all reasonable inferences and presumes in support of the judgment the existence of every fact that a jury reasonably could have deduced from the evidence. Generally, the testimony of a single witness is sufficient to prove a disputed fact. (People v. Young (2005) 34 Cal.4th 1149, 1181.) The trier of fact makes credibility determinations and resolves factual disputes. An appellate court will not substitute its evaluation of a witness's credibility for that of the fact-finder. The appellate court will not reverse a jury's verdict, solely because it would have reached a different result if it had been the fact-finder. (Vazquez, supra, 178 Cal.App.4th at p. 352.)