So there are two issues with this study, that I see.
1. 4% versus 100% - how do you define this? If I get harassed once, as a man running, does that mean that I have been harassed? And that counts exactly the same as a woman who gets harassed twice a week on her runs? I'd say that those two situations are not in any way comparable, yet the study possibly does conflate the two. I have been harassed (as a man) while running, maybe it happens once every couple of years. My girlfriend, on the other hand, deals with comments like "hey beautiful" or "what do you have on under those shorts" on a weekly basis. To say that we have both been "harassed" does not do justice to the situation.
2. A man getting harassed and a woman getting harassed are not the same thing. Why? Simple reason that one is threatening and the other is humorous, or possibly even flattering. A man could kill a woman with his bare hands. A woman could not do that to a man. So the same comment directed at a woman from a man versus at a man from a woman is completely different, and not on the same level.