Mills, L. R. (1973). Six-member and twelve-member juries: An empirical study of trial results. University of Michigan Journal of Law Reform, 6, 671-711.
No impact of jury size on liability verdicts. Percentage of verdicts for plaintiff varied by case type for 6-person juries but not 12-person juries. Six-person jury awards tended to be larger and more variable for auto negligence cases.