Question

Give an example of a type of study design and explain what kind of research questions that study design would be useful in answering

Answer 1

1 Lets look at an eg of study design ,Meta-analysis.Previous studies have shown conflicting results as to whether peridontitis is associated with increased risk of coronary heart disease.Metanalysis of the 5 perspective cohort studies indicated that individuals with PD had a 1.14 times higher risk of developing CHD than the controls(relative risk 1.14,95%CI 1.074-1.213,P greater ththat an .001),indicating that both the prevalence and incidence of CHD are significantly increased in PD andPD maybe a risk factor for CHD.

it has greater statistical power,confirmatory data analysis,greater ability to extrapolate to general population affected and is considered an evidence -based resource.it summarize the body of evidence on a specific question and this approach replaces the traditional narrative review.it can hel identify which questions have already been answered and which remain to be answered,which outcomes measures or population are most likely to yield significant results and which variants of the planned intervention are likely to be most powerful.