Respondents: A questionnaire survey was conducted on 26 residents of different ages in the Yangling Demonstration Zone. Randomly 26 residents of different ages are middle-aged people aged 30-50 years old, middle-aged people aged 50-60 years old and elderly people aged 60 years and older. Questionnaire issuance and recovery: 26 questionnaires were issued to recover 25 questionnaires and 25 valid questionnaires.
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