CONSANGUINITY AND ITS RELATIONSHIP TO DIFFERENTIAL FERTILITY AND MORTALITY IN THE KOTIA - A TRIBAL POPULATION OF ANDHRA-PRADESH, INDIA

Data on patterns of marriage, differential fertility and mortality wer e collected from 211 Kotia women residing in Visakhapatnam district of Andhra Pradesh, India. Consanguineous marriages made up just over a q uarter of the total, and of these, father's sister's daughter (FSD) we re more common than mother's brother's daughter (MBD). The mean inbree ding coefficient for the sample (F) was 0.0172. Women in consanguineou s marriages had a lower mean number of total conceptions, live births and living offspring (net fertility) than women in non-consanguineous marriages. Significant heterogeneity was found in the means of living offspring for FSD, MBD and non-consanguineous couples, but not for con ceptions and live births.