I don't remember the details of basic swimming tests but that sounds about right. The bottom line is that if you end up in the water within sight of shore under

I don't remember the details of basic swimming tests but that sounds about right. The bottom line is that if you end up in the water within sight of shore under normal conditions you shouldn't panic or drown. I can easily believe 60-80% depending on the criteria. I haven't swum regularly for years and was never a real distance swimmer but I can swim by any reasonable measure.