In assessing a claim that the jury's award of damages is excessive, what is the test for assessing excessive damages?

"In assessing a claim that the jury's award of damages is excessive, we do not reassess the credibility of witnesses or reweigh the evidence. To the contrary, we consider the evidence in the light most favorable to the judgment, accepting every reasonable inference and resolving all conflicts in its favor." (Westphal v. Wal-Mart Stores, Inc. (1998) 68 Cal.App.4th 1071, 1078 (Westphal).) "We must uphold an award of damages whenever possible [citation] and 'can interfere on the ground that the judgment is excessive only on the ground that the verdict is so large that, at first blush, it shocks the conscience and suggests passion, prejudice or corruption on the part of the jury.' " (Ibid.)