Not to keep arguing a dead point, but the word I cared about was "causes" not "show". The study shows pretty definitively ("proves") that a correlation exists. It does not show that hormonal birth control causes depression.
Regardless, I appreciate that you're making an effort to be careful. I've just been seeing this particular study making the rounds on Facebook and I felt like I needed to point out what the study actually says.
Regardless of semantics, I'm glad you see it being shared on Facebook. I really hope it inspires women to stop taking their pills and go all Lysistrata until there is more research done and/or a better solution is invented. I mean, it's the same thing that was invented back in the 1960s. There's been very little progress.
I wish they could invent something semi permanent for men. Then we could cease having the current child support debates. Temporary vasectomy would be awesome for the world.
I am really very careful not to use the word "proved" for the same concerns you have.