Of all names mentioned in this census, conducted by the Ottomans in 1455, covering a part of Eastern Kosovo, 96.3% of the names were of Slavic origin, 1.90% of Roman origin, 1.56% of uncertain origin, 0.26% of Albanian origin, 0.25% of Greek origin, etc. Serbian scholars consider that the defter indicates an overwhelmingly Serbian local population. Madgearu instead argues that the series of defters from 1455 onward "shows that Kosovo... was a mosaic of Serbian and Albanian villages", while Prishtina and Prizren already had significant Albanian Muslim populations, and that the same defter of 1455 indicates the presence of Albanians in Tetovo This interpretation of nationals living there is vague and unreliable to actually determine the Serb, Albanian, Bulgarian, Greek, Jews and Croats who lived in Kosovo in 1455 for the reason that the ottomans never conducted populations censuses based on nationality or language. The Ottomans cadastral tax records only mention the religion of the dwellers in Kosovo not nationalities. The accuracy and the consistency of the registration has been doubted as shown in the example of Janjevo (a primarily Catholic Croat  village in eastern Kosovo) which according to the reading of the register had only one Croat household.