The study found an increase of "0.9%", yet doesn't give a margin of error (and the journal article is paywalled[0] for $40), and that sounds like a really small

The study found an increase of "0.9%", yet doesn't give a margin of error (and the journal article is paywalled[0] for $40), and that sounds like a really small increase, so small that for all we know, the actual (as opposed to measured) delta was zero or negative. How can this be useful for public policy debates if the full text is not publicly available? And how can we find errors in publicized studies if we can't even read them? [0]: http://www.sciencedirect.com/science/article/pii/S0167629615001150 http://www.sciencedirect.com/science/article/pii/S0167629615...