A scientific approach to entrepreneurial decision-making: large-scale replication and extension · Camuffo, Gambardella, Messinese, Novelli, Paolucci and Spina, Strategic Management Journal
The Bocconi record of the paper describes four randomised trials and 759 firms. It reports a positive impact on idea termination, and that treated firms tended to run a few pivots rather than none or repeated pivots. The abstract on the cited page does not state a percentage-point figure, so this site does not either.