“…Firstly, we used a dummy variable for the gender, with gender = 1 for male and gender = 0 for female. Then, given that the adoption decision is influenced also by the financial capacity of the family [9], the income was another control variable. We used a discrete variable for the net household income per year, with net household income per year = 1, 2, 3, 4 and 5 for less than 15,000€, 15,001€-30,000€, 30,001€-45,000€, 45,001€-60,000€ and more than 60,000€, respectively.…”