In accordance, systematic reviews and meta-analyses on these birth cohort studies reproduced inconclusive evidence, revealing no association with asthma or wheezing ( 66 ), a U -shaped association with a lower risk of childhood asthma at maternal 25(OH)D levels of 30 ng/ml (70 nmol/l) ( 67 ) and a borderline significant inverse relationship ( 68 ).
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Can Getting Enough Vitamin D during Pregnancy Reduce the Risk of Getting Asthma in Childhood?
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