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Comment by DrScump | Hacker News Reader

  Substance abuse was also mentioned by 12% of cities as one of the top three causes of homelessness

That would mean that for 88% of cities, substance abuse was not in the top 3 causes mentioned.

You left off the key part of the sentence: "for families." For single adults, substance abuse was the most oft-cited cause (68% of cities). See page 19 of: http://www.ncdsv.org/images/USCM_Hunger-homelessness-Survey-...