*2.2. Sample Selection*

The data used in this study was obtained from 5000 participants selected among the general population during the TKM usage survey in 2017. When the 5000 participants, who were the national survey samples, were selected, they did not enroll both parents from a family. In particular the following selecting questions were used to assess eligibility: Do you have a child who is under 19 (born after September 1998)? (1) Yes [the number of children under 19 is (...)] (2) No. The participants in the survey item or were the parent who was the caregiver of the children. Also, we instructed the participants to tell us the number of children in their family if they answered they had a child under 19. This resulted in the inclusion of 872 participants who chose 'Yes'. Their answers were included for analysis in order to obtain the results on the satisfaction and awareness data, as well as the information regarding their children. The selection process of the participants is shown in Figure 1.

**Figure 1.** Flow chart of inclusion and exclusion of participants from the 2017 National Survey of Traditional Korean Medicine Usage. TKM: Traditional Korean Medicine.
