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Covid-19 has increased anxiety for many of us, and experts warn a sizable minority could be left with mental health problems that outlast the pandemic. I am worried that youth may suffer from mental health risks… As volunteering might be helpful for youth’s mental health, our center plans to conduct a program for promoting volunteering activities among youth. As for the program evaluation, I want to collect longitudinal data to record the changes in volunteering time and mental health. What types of errors may occur?