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It was self-reported, of course, how would you want to conduct this kind of poll...

The methodology is of course deeply flawed. Even though the anonymity of the poll allows people to report such issues without guilt (or even with pride), it also encourages trolling.

I didn't start that poll, I just happened to pass by while it was being held. I read around 150 answers. My memory isn't perfect, but here is what I remember. None of the 15 females reported a normal mental health or even mild troubles. Around the same number of males reported serious mental issues (things like bipolar disorder, borderline personality, multiple phobias, panic attacks, major depression, schizophrenia, hospitalization in mental health institutes for whatever reason).

I'm not sure why girls would be culturally more inclined to report severe mental illness (even though, from my clinical experience, I wouldn't be surprised if they had a tendency to report mild mental troubles more easily). Is this bias documented somewhere? Also, even if such a bias exists, it wouldn't explain such a wide difference.

Assuming that the poll was not massively rigged by trolls, and with only 66% of females with mental issues, the P-value of Fisher's exact test is under 0.001.

    120  15 | 135
      5  10 |  15
    --------+----
    125  25 | 150
http://statpages.org/ctab2x2.html

The probability of getting a sample with 66% of the females in good mental health (keeping the rate in males identical) when there is no gender difference regarding mental health in the population is around 0.03.




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