According to the survey, the overwhelming majority of Australian and New Zealand directors cited their networks as the source of their board seats.
"In contrast, only 30 per cent of female and 27 per cent of male directors obtained their roles via executive search firms," the survey said.
But the study also found few respondents, both male and female, favoured the introduction of quotas - such as those found in some parts of Europe - for women on boards.
Only 30 per cent of women and 26 per cent of men said quotas would be an effective means for increasing boardroom diversity, according to the survey.
"Women expressly don't want to be appointed as a result of quotas - they want to be around the boardroom table based on merit and qualifications to serve," said Andrea Waines, of leadership consultancy Heidrick & Struggles' Auckland office.
The survey also found that, despite being better educated than their male counterparts, women were overwhelming relegated to non-executive director roles.
"Not one in our sampling, and a mere handful of the total ASX 100 and NZX 50, are chairs," the survey said.
Sixty per cent of the women surveyed had an advanced degree, compared with 41 per cent of men.
However, 39 per cent of male participants identified their position on the board as chair and 42 per cent as an executive director, while 90 per cent of women respondents were non-executive directors.