highly significantp < 0.001
Applying a chi‐square text on the genotypes NN and NC observed in the first five years (from 2009 to 2013) versus the last five years (from 2014 to 2018), we obtained a value highly significant ( p < 0.001), so that the number of carrier subjects observed from 2014 to 2018 is significantly lower if compared to the one observed in the first five years.