cultural context.  For example, delusions of guilty are frequesnt in a Western, Christian country like Austria, but not in Pakistan  http://content.karger.com/ProdukteDB/produkte.asp?Aktion=ShowPDF&ProduktNr;=224276&Ausgabe;=226529&ArtikelNr;=29094.  This report shows frequesnt delusions of guilt in Austria as well