2.5. Sample size
For each of the videos, participants were recruited through the Credamo platform to watch the video and fill out the questionnaires. The survey lasted from April 24 to April 29, 2022, and involved 780 participants from 31 provincial-level administrative regions (excluding Hong Kong, Macao, and Taiwan). Of the 780 respondents, 27 respondents were excluded for poor quality of the questionnaires or an abnormal amount of time spent on the questionnaires (too long or too short).During the trial, there were 780 visits to the questionnaire website, and 753 (96.5%) participants were found to be eligible for the study. No significant differences in age, sex, education, or employment were found between the two groups for each video pair (Summary of participant demographics.Analyzed by the independent-samples Analyzed by the Chi-square test