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Unadjusted risk ratios, with 95 % CI represented by vertical bars, for the association between folic acid deficiency and Indigenous status, from 1 January 2004 to 31 December 2015 (n 291 908), Queensland, Australia: 
, risk ratio between the prevalence of folic acid deficiency in Indigenous v. non-Indigenous persons; 
, reference line included to illustrate a risk ratio of 1 (identical risk in both groups)
