Not an advantage of case control studies:
|A||Cost effective and inexpensive|
|B||Odds ratio can be calculated|
|C||Relative risk can be calculated|
|D||Useful in rare diseases|
One of the biggest disadvantages of case control studies are that incidence of the disease cannot be calculated and hence the relative risk cannot be computed. All the other options are in fact advantages of doing a case control study.
Advantages of case control studies:
a. Relatively easy to carry out.
b. Rapid and inexpensive.
c. Requires comparatively few subjects.
d. Particularly suitable to investigate rare diseases or diseases about which little is known.
e. No risk to subjects.
f. Allows the study of several different etiological factors.
g. Risk factors can be identified and rational prevention and control programs can be established
h. Odds ratio (OR) can be derived from a case control study. Odds ratio is a measure of the strength of the association between risk factor and outcome.
i. No attrition problems, because case control studies do not require follow up of individuals into the future.
j. Ethical problems are minimum.