The prevalence of Osteomyelitis is rare. I don't do percentages...but Google says there are fewer than 200,000 US cases. I think there are more than that in other countries. I believe that children are more affected by it and it doesn't matter whether boy or girl.
I am reading more and more about the elderly though, now that I am one of those. It is saying we are more prone now to osteo than before, because we get sick more.