Data collection
Proportional quota sampling was used to recruit participants
who represented the target population in relation to demographic
characteristics. For the purposes of this study, Korea
was organized into five geographic areas, and the number of
participants in each area was estimated based on the number
of college students reported by the Ministry of Education,
Science, and Technology. The target population of Korean
college students was sampled, taking into account the students’
location (five geographic areas) and type of university
(4 year college or 2 year community college).