Not sure on this one,DNA testing for baldness imo is not accurate as there are too many variables.
Interesting though that they say 40% are women who experience hairloss,this again is up in the air as i reckon by hairloss they are counting people who`s hair thins out a little but not to the extent for them to be overly concerned and see it as a problem.
The gene thing for me makes no sense because I know of at leat 2 people, who had this test (Positive),but have not lost any hair, to date. Trying to find a scientific explanation for hair loss is like finding a needle in a haystack. The process is so random sometimes its impossible to pin down a single cause and apply it to anyone.