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. 2021 Feb;10(2):723–736. doi: 10.21037/tlcr-20-700

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2021 Translational Lung Cancer Research. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Changes in the number (A) and characteristics (B) of participants over time. (A) shows the changes in the number of participants over time. (B) shows the changes in the characteristics of participants over time. “Current smokers” refer to the percentage of currently smoking participants in each month. “Low income” refers to the percentage of low-income group (monthly household income of less than 2 million KRW). “Heavy smokers” refer to the percentage of participants who have a smoking history of 45 pack-years or more. “Less educated” refers to the percentage of participants who finished secondary education or less, and “smoking clinic path” refers to the percentage of participants from participating smoking clinics. The newspaper advertisement targeting the general population was published on September 22, 2017, but it generally takes 1 week for the participant to undergo screening. Here, we compared the participant characteristics before and after October 1, 2017 as we assumed that the effect of the advertisement began around this date.