I don't know who comes up with these studies, but it's likely complete drivel.
I've only seen CPR given once in my life, and the recipient was female. She was an older woman and kept alive about 25 minutes while we awaited paramedics.
Those delivering the CPR were a nurse (female) and a man who had been trained for this activity.
The recipient was a woman at my church, not particularly healthy and about 60 years old. She died just over a year later of some version of heart failure.
People trained in CPR aren't going to respond more slowly or not at all because the person in need is female. It says right here, that's bunk, and a reporter who would allow a byline on such a story needs a new line of work.
Sneaking in a little feel?
People trained in CPR
we are all racist and sexist...