I need to do stastics reasarch project in college.I have to conduct resasarch study ( i want to talk about effect on mental health before and during covid -19 pandemic.

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i am thinking of comparing mental heath before and during pandemic. . how can i comapre it with past mental heath report . caI need suggestion coming up with a Resarch question related with this particlar topic.

How can i conduct my rsarch studay .how can compare the effect on mental health before during pandemic. ca i get suggestion on where i can get preexisting data . subject to study (their age range ) and sample size.