As a warning, this page spends multiple pages teaching you about their gender findings before giving you your results. I had to go through 20+ pages of teaching before getting a prediction on my gender.
"The biggest correlation we found between gender and any one personality trait was r=0.42, which means that gender explains 18% of the variability in that trait. Another way to put this is... if you knew a random person's score on that one personality trait, and you tried to guess that person's gender using just that score, you'd mispredict that person's gender 31% of the time!"
They think that's low! That's crazy high for just one trait, it would be called "Highly significant" in any paper.
By the way, the test really isn't all that interesting IMO. The results were extremely predictable, in my case at least.