Multiple answers were allowed.

* To qualify for the survey, respondents need to have stayed in South Korea for more than one day and less than one year.
Those who just arrived to transfer the flight were excluded;
Pilots, flight attendants and soldiers were excluded, except when their purpose of visit was tour;
Only one of two people in a group was invited to the interview;
Up to two in a group with over ten people were invited to the interview considering age and gender distribution;
Up to four people in a package tour group were invited to the interview.