A study was conducted to investigate the relationship between COPD and smoking. Data was collected from government hospital records on COPD cases and cigarette sales records from finance and taxation departments. What is the study design?
ACross-sectional study
BOperational study
CCase-control study
DEcological study
Which of the following best describes a cohort study?
AA cross-sectional study that collects data at a single point in time.
BA case-control study that compares individuals with a condition to those without.
CA study that observes a group of individuals over time to assess the impact of a risk factor.
DA study that randomly assigns participants to intervention and control groups.
A new drug has been introduced into the market which was found to decrease mortality but it does not cure the disease. Which of the following is a true statement regarding prevalence and incidence?
AIncrease in prevalence
BDecrease in incidence
CDecrease in prevalence
DIncrease in incidence
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