Figure 2: The association between placental tissue histone H4 acetylation levels at promoter region of the HDAC4 gene and the risk of sensitization to aeroallergens in children. For the methodology of statistical calculations, please, see Methods. For abbreviations, see Figure 1. Calculated with logistic regression since the number of observations in the group of boys precluded the estimations of OR and CI with the GEE model.