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Distribution (Tukey’s boxplots) of HbA1c according to pregnancy stage during type 1 diabetes pregnancies. HbA1c is expressed as percentage. Before pregnancy, recommended HbA1c is <6.5%. During pregnancy, HbA1c is considered as normal for values <5.4% in the first and second trimester and values <5.7% in the third trimester [10]. Reference values of HbA1c (in %) according to trimester is represented by the broken black line (- - -).
