Data-Basis:
The data are representative of the Bulgarian population in the age intervall of 18 to 70 years, or a total of 5.8 million people.
Instrument:
Standardized individual interview in person; an individual conversation with the subject. The interviewer read the question, waited to hear the subject' s answer and checked one of the alternatives.
Sample:
The sample is a two-level stochastic cluster one. It is drawn from the election lists of the election sections; their total number for the country is 12.691; the sample includes 200 /1.6 % of the total number).
The first step of the sampling procedure included first the random stratified selection of 200 election sections. This guaranteed the representativeness of settlement' s size and the equal distribution on the country' s territory.
In the second step ten people were randomly selected on the election list of each election section. The list of every cluster contained six individuals for interviewing and four more to serve the function of a reserve if someone of the six could not be interviewd.
