Country Incidence Australia 1 in 10,000 Brazil 1 in 8,690 Canada 1 in 22,000 China 1 in 17,000 Czechoslovakia 1 in 7,000 Denmark 1 in 12,000 Finland 1 in 200,000 France 1 in 13,500 India 1 in 18,300 Ireland 1 in 4,500 Italy 1 in 17,000 Japan 1 in 125,000 Korea 1 in 41,000 Netherlands 1 in 18,000 Norway 1 in 14,500 Philippines 1 in 102,000 Poland 1 in 8,000 Scotland 1 in 5,300 Spain 1 in 20,000 Sweden 1 in 20,000 Turkey 1 in 2,600 United Kingdom 1 in 10,000 United States 1 in 25,000 The average number of new cases of<unk>  varies in different human populations. United States Caucasians are affected at a rate of 1 in 10,000. Turkey has the highest documented rate in the world, with 1 in 2,600 births, while countries such as Finland and Japan have extremely low rates with fewer than one case of<unk>  in 100,000 births. A 1987 study from Slovakia reports a Roma population with an extremely high incidence of<unk>  (one case in 40 births) due to extensive inbreeding. It is the most common amino acid metabolic problem in the United Kingdom.
Phenylketonuria
Hawkinsinuria
Homocystinuria
Alkaptonuria
3-Methylglutaconic aciduria
2-Hydroxyglutaric aciduria
Alpha-aminoadipic and alpha-ketoadipic aciduria
Aspartylglucosaminuria