The questionnaire consisted of two parts: demographics and KAP. Demographic variables included age, gender, marital status, education, occupation, and place of current residence (Hubei vs. other provinces of China).
According to guidelines for clinical and community management of COVID-19 by the National Health Commission of the People's Republic of China 10 ,11 , a COVID-19 knowledge questionnaire was developed by the authors. The questionnaire had 12 questions (Table 1): 4 regarding clinical presentations (K1-K4), 3 regarding transmission routes (K5-K7), and 5 regarding prevention and control (K8-K12) of COVID-19. These questions were answered on a true/false basis with an additional “I don't know” option. A correct answer was assigned 1 point and an incorrect/unknown answer was assigned 0 points. The total knowledge score ranged from 0 to 12, with a higher score denoting a better knowledge of COVID-19. The Cronbach's alpha coefficient of the knowledge questionnaire was 0.71 in our sample, indicating acceptable internal consistency 12 .
Attitudes towards COVID-19 were measured by 2 questions (A1-A2, Table 1) about the agreement on the final control of COVID-19 and the confidence in winning the battle against COVID-19. The assessment of respondents' practices was composed of 2 behaviors (P1-P2, Table 1): going to a crowded place and wearing a mask when going out in recent days.
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