Question: For the two studies below, what is the study design and two reasons why you know its that study design. A ) a study was

For the two studies below, what is the study design and two reasons why you know its that study design.
 A)a study was conducted to determined if serum vitamin d levels were linked to hip fractures. a group of hospitalised patients newly diagnosed with hip fractures together with a group of healthy adults in communities were recruited. serum vitamin d levels were assessed among all participants
. B) a study compared the changes in age-standardised lung cancer mortality rates (per 100,000 population) by sex from 1945 to 2020, and the prevalence of daily smoking by sex, 1964-2019. 

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