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Boxplot of serum folate concentrations (ng/mL) by asthma status. The red dotted line represents a serum folate concentration of 20 ng/mL; this has been deemed as a possible cutoff for folate deficiency associated with asthma-related outcomes. Percentage of children who were considered folate deficient (serum folate ≤ 20 ng/mL) in each subgroup: children with asthma 52%, controls 42%.
