Hi, could I ask the experts here? My research objective is to

1. To look for Prevalence and factors associated with Long Covid

2. To look for the association between Qol and Long Covid

I just want to ask for objective number 1, I should do univariable and multivariable regression to look for associated factors. How about objective number 2? Can I just use chi-square to look for the association between QoL and Long Covid( Long Covid Yes/No and QoL Yes/No), or should I do again univariable and multivariable for all factors associated with QoL then only look for the association with Long Covid?

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