Controls of the same type in case-control studies are sometimes used to increase the power of...

Controls of the same type in case-control studies are sometimes used to increase the power of the study.

True

False

Expert Solution

ANSWER: True

Controls of age sex matched with cases increases the power of the study. Controls should come from the same population as cases increase the power of the study.

If controls are almost like cases then the accuracy and power increases. In otherwords we are matching accurately for confounding factors.

A study that compares patients who have a disease or outcome of interest (cases) with patients who do not have the disease or outcome (controls), and looks back retrospectively to compare how frequently the exposure to a risk factor is present in each group to determine the relationship between the risk factor and the disease.

Case control studies are observational because no intervention is attempted and no attempt is made to alter the course of the disease. The goal is to retrospectively determine the exposure to the risk factor of interest from each of the two groups of individuals.

orchestra answered 1 year ago

Discuss the advantages and disadvantages of using hospital patients as controls in case-control studies.

Standby power (sometimes called vampire power) is the power used by a device that is off...

Standby power (sometimes called vampire power) is the power used by a device that is off but plugged in and in a standby mode. Regulations typically limit this power to 1 Watt. If electricity costs $0.10 per kilowatt-hour, then to the nearest order of magnitude, and assuming 1 Watt, how much does it cost to leave a device in standby mode for one year? (A) $0.01 (B) $0.10 (C) $1.00 (D) $10.00 (E) $100.00

briefely describe case-control studies and experimental studies and their importance in healthcare. as well as the...

briefely describe case-control studies and experimental studies and their importance in healthcare. as well as the critical role IRBs play

When selecting controls for a case-control study, all of the following are considerations except: Controls should...

When selecting controls for a case-control study, all of the following are considerations except: Controls should estimate the distribution of exposure in the source population Controls should be sampled independently of exposure status Controls need to be representative of at risk population. Controls should not have the same exposure prevalence as the cases None of the above.

What are single case studies and how are they used in research?

In a case-control study, cases and controls are compared in order to determine whether they differ...

In a case-control study, cases and controls are compared in order to determine whether they differ with respect to their exposure levels. true or false?

INCREASE, DECREASE, STAY THE SAME OR NOT ENOUGH INFO What happens to the power of a...

INCREASE, DECREASE, STAY THE SAME OR NOT ENOUGH INFO What happens to the power of a pairwise comparison if Tukey's HSD is used instead of a planned comparison? What happens to F-critical, if the between-groups variance decreases? What happens to the degrees of freedom for the interaction term in a two-way ANOVA when the number of rows increases, but the number of columns decreases (not necessarily by the same amounts) What happens to the number of degrees of freedom in...

Obtain 95% confidence interval in the following studies . Six coins of the same type are...

Obtain 95% confidence interval in the following studies . Six coins of the same type are discovered at an archaeological site. If their weights on average are significantly different from 5.25 grams then it can be assumed that their provenance is not the site itself. The coins are weighed and have mean 4.73 g with sample standard deviation 0.18 g. Obtain 95% confidence interval for the mean.

Why is the potential for bias a particular problem in case-control studies as opposed to other...

Why is the potential for bias a particular problem in case-control studies as opposed to other analytic designs?

explain the damping used in induction type instrument(eddy current damping) and type of control used

Question