In male speech, either um or uh accounts for about one out of fifty words; for female speech it is only one out of seventy words

How We Talk: The Inner Workings of Conversation. N. J. Enfield. Basic Books, ISBN-13: 978-0465059942. https://www.amazon.com/How-We-Talk-Workings-Conversation/dp/0465059945

"In male speech, either um or uh accounts for about one out of fifty words; for female speech it is only one out of seventy words."

Check also What Shall We Talk about in Farsi? Content of Everyday Conversations in Iran. Mahdi Dahmardeh, R. I. M. Dunbar. Human Nature, http://www.bipartisanalliance.com/2017/08/content-of-everyday-conversations-in.html. Pay attention to the table there.