>>76543012
the first number it gives you is just all people, then for your sex and then for your age group (and still sex probably?). I think if this is just based on real 5k race results, there's a lot of people that sign up for them that aren't serious, muddying the water. Strava will self-select for more serious runners obviously.
Even garmin's data is tainted by people who don't do shit.