Table 2 . Socioeconomic factors' definitions .

Socioeconomic factors	Classic Definition
Age group	Persons classified by age from birth (INFANT, NEWBORN) to octogenarians and older (AGED, 80 AND OVER).
Sex	The totality of characteristics of reproductive structure, functions, PHENOTYPE, and GENOTYPE, differentiating the MALE from the FEMALE organism.
Educational level	Educational attainment or level of education of individuals.
Marital status	A demographic parameter indicating a person's status with respect to marriage, divorce, widowhood, singleness, etc.
Occupation Income	Crafts, trades, professions, or other means of earning a living. Revenues or receipts accruing from business enterprise, labor, or invested capital.
Residence characteristics	Elements of residence that characterize a population. They are applicable in determining need for and utilization of health services.
Urbanization	The process whereby a society changes from a rural to an urban way of life. It refers also to the gradual increase in the proportion of people living in urban areas.
Social condition	The state of society as it exists or in flux. While it usually refers to society as a whole in a specified geographical or political region, it is applicable also to restricted strata of a society.
Social class	A stratum of people with similar position and prestige; includes social stratification. Social class is measured by criteria such as education, occupation, and income.