Is it possible that case series study contain control group ,but there are no intervention or investigation were done for both,just a history ?

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Eugen Iordanescu

The nature of case series study (case control studies?) is observational.So no intervention is intended or needed. Best,

Magdy Eisa Saafan

One should not use control group in case series study otherwise it will be comparative study not observational study.we should strict to the appropriate study designs.in case study and case sereis , no control groups are used.