Even the descendants of ADD immigrants are more likely to have ADD themselves. There is a 30% chance for children to get ADD when 1 parent has got it and 50% ch

Even the descendants of ADD immigrants are more likely to have ADD themselves. There is a 30% chance for children to get ADD when 1 parent has got it and 50% chance when both parents have it. Therefore percentage of people having ADD should be much higher in America than anywhere else.