[joshuahaglund]

The number is limited to people aged 15-39. I can't figure out what percent that is, maybe someone with a wolfram alpha pro account can do it:

https://www.wolframalpha.com/input/?i=population+of+japan+be...

Also, having trouble leaving the house vs: The Health, Labor and Welfare Ministry defines hikikomori as people who have stayed at home for at least six months without going to school or work, or going out to interact with others.

[pyb]

Yes, they're not measuring the same things. "having trouble leaving the house" != "never leaving their room"

[guroot]

You just have to phrase it correctly: https://www.wolframalpha.com/input/?i=population+of+japan+ag...

It's 4.75% according to alpha based on a 2010 estimate.

[antmldr]

I think that's the 15-19 age group...

[guroot]

Ah, you're right I didn't look closely at the results. derp

[aidenn0]

It's about 45 million people aged 15-39, which would mean it's still under 2%