Epidemiologists Tried to Examine the Distribution of Multimorbidity,and of Comorbidity

Multiple Choice

Epidemiologists tried to examine the distribution of multimorbidity,and of comorbidity of physical and mental health disorders,in relation to age and socioeconomic deprivation.They extracted data on 40 morbidities from a database of 1,751,841 people registered with 314 medical practices in Scotland as of March 2007.They analyzed the data according to the number of morbidities,disorder type (physical or mental) ,sex,age,and socioeconomic status.They defined multimorbidity as the presence of two or more disorders.[From Barnett K,Mercer SW,Norbury M,et al.Epidemiology of multimorbidity and implications for health care,research,and medical education.Lancet.2012;380(9836) :37-43.] What is the proper classification for this study?

A) Cross-sectional study
B) Prospective cohort study
C) Case-control study
D) Randomized trial
E) Case report