Sajkas, small village in Backa, in which in 1990 there were 2987 people which was made up of a different ethnic population of Serbs, Germans and Hungarians. According to Lepage Y., there were the most frequent marriage between couples who were born in Sajkas /32,35%/. After 1950 there was an increase in the number of marriages between couples not born in Sajkas and in the period 1960-1969 this percentage was 63,75%. According to Serbian ethnic background there were the most number of marriages between couples with the bridegroom from Sajkas and the bride from the elsewhere /33,18% and after 1950, when the couples were not born in Sajkas. With the German population there were the largest number of marriages between couples who were born in Sajkas /60,54%/. Where the groom was from Sajkas and the bride was from elsewhere in 72,59% cases the marital distance was under 30 km. It was similar in the opposite combinations of marriages. When the couple were not born in Sajkas the marital distance is higher with new-comers from Bosnia and Herzegovina. The index of homogamy amounts to 0.1393 and indicates on open population. The grooms are older than the brides in all the marriages combinations and in the last few decades, Serbian are older than at the beginning of the century. There was a greater age difference between the groom and bride in the German population, especially in cases where both were born in Sajkas. Marriages between people of the same surname happened in the Serbian and German populations; The sex ratio in Sajkas was favored the male population because for every 100 girls born in Sajkas there were 106,28 boys. According to ethnicity for every 100 girls born there were 100,52 Serbian boys, 109.85 German boys, 126.92 Hungarian boys and 150 Jewish boys and 133.33 Gypsy boys. The number of deaths in Sajkas shows that more men died to women: for every 100 women 108.34 males. The natural increase in Sajkas was positive in all the decades.
