Sample Design and Fieldwork
sample was designed to represent the population of the Republic of Korea
age 20 and over. The 2000 report of the Population and Housing Census
of the national Statistical Office was used to first stratify the population
by the eight provinces (Do) and the seven large cities on the basis of
their proportionate share of the national population. The island of Jeju-Do,
with 1.1 percent of the total population, was excluded. Secondly, each
province or large city was stratified by administrative subdivisions
(Dong, Eup and Myeon) on the basis of its proportion of the population.
At the third stage, the primary sampling units (ban or village) were
randomly selected with six to eight households in a ban and twelve to
fifteen in a village. At the household level, the interviewer was instructed
to select for interview the person whose birth came first.
was undertaken by regularly employed interviewers of the Garam Research.
Each interviewer participated in a one-day orientation session and completed
three trial interviews. A random selection of 20 percent of interviews was
independently validated. All interviews were face to face. Fieldwork
started on 10 February and ended on February 22, 2003. If no one was
at home at a household or if the adult selected for interview was not
at home, the interviewer was instructed to call back three times. A total
of 3,224 addresses were selected. At 649 addresses, there was no one
at home after three callbacks, so that the household residents could
not be listed and a respondent selected. Of the 2,575 households where
an individual name could be selected by the birthday method, 32 individuals
were not interviewed because they were too old or infirm or absent from
the household; 630 refused; and 413 were not completed because of the
respondent’s impatience, for which Koreans are notorious. A total of
1,500 interviews were satisfactorily completed, registering a response
rate of 58 percent. The mean length of interviews was 60 minutes; the
range was from 50 to 90 minutes.