It turned out that Gryffindors were no more open to experience than the other houses, though they were ever-so-slightly more extraverted. Hufflepuffs did not score more highly on the need to belong than the other houses, but they were the most agreeable of the four. But Ravenclaws' need for cognition and Slytherins' tendency towards the Dark Triad traits did play out in the data.
"We found less conclusive information for Gryffindors, probably because a 'bravery trait measure' was not available, and we had to use things that seem to relate to bravery instead," Dr Laura Crysel, lead author of the paper, told BuzzFeed Science over email. "I am a Gryffindor, so I wish I had more to say about Harry’s house; however, the data we have cannot speak to it."
Only about half of the people in the study were sorted into the house they wanted by Pottermore. This is greater than chance, says Crysel, but "it also says to me that people weren't able to cheat the quiz across the board, and that it may be saying something about how people really are."