Would the world be more peaceful if there were more women leaders?

(…) throughout history, women leaders have been extremely rare. Between 1950 and 2004, according to data compiled by Katherine W Phillips, professor of leadership and ethics at Columbia Business School, just 48 national leaders across 188 countries – fewer than 4 per cent of all leaders – have been female. They included 18 presidents and 30 prime ministers. Two countries, Ecuador and Madagascar, had a woman leader, each of whom served for a mere two days before being replaced by a man.

Given the tiny sample size, does it even make sense to ask if, given power, women are more or less likely than men to wage wars?