What is the test for a finding that a jury found a plaintiff liable in a personal injury case in negligence?

A reviewing court "may uphold the order granting judgment notwithstanding the verdict, and affirm the judgment based thereon only if, reviewing all the evidence in the light most favorable to [the party who obtained the verdict], resolving all conflicts, and drawing all inferences in [that party's] favor, and deferring to the implicit credibility determinations of the trier of fact, there was no substantial evidence to support the jury's verdict." (Begnal v. Canfield & Associates, Inc. (2000) 78 Cal.App.4th 66, 72.)