The study observed population of 484 generation restrictive genealogies collected in
four Croatian regions during 1970/71 within »The study of fat and carbohydrate metabolism
indicators correlated with the occurrence of diabetes in animal fat and oil consuming
population groups«. The genealogies were collected on two islands (Bra~ and
Hvar) and in two continental regions (Sinjska Krajina and Srijem). Genealogy Structure
Index (GSI) was defined as quantitative indicator of genealogy structure. GSI was
continuos variable which, by its extreme, describes vertical and horizontal type of genealogy
structure, independently of the way genealogies were collected. Genealogy structure
of surveyed population was described on the basis of participation of different genealogy
types. Populations of the island Hvar and Bra~ showed to have horizontal genealogy
type, continental population of Sinjska Krajina showed to have mixed type and
continental population of Srijem showed to have vertical type of genealogy structure
