For the two studies below, what is the study design and two reasons why you know its
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For the two studies below, what is the study design and two reasons why you know its that study design.
Aa 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 agestandardised lung cancer mortality rates per population by sex from to and the prevalence of daily smoking by sex,
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