An observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute.
Questions tagged [case-control-study]
184 questions
11
votes
2 answers
Optimal case/control ratio in a case-control study
What is the optimal case/control ratio in a case-control study? Why do most textbooks or monographs suggest that it is more than 1? Can it be less than 1 (what are the drawbacks?)? Thank you.
KuJ
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Case Control Study
Suppose we have identified $20$ cases from a population of $1000$ people. $15$ of these cases are male. We want to use one-to-one matching to choose the control group. We would match on gender. So would we just randomly choose $15$ males from the…
epiguy
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0 answers
Join data sets from retrospective studies
I'm doing the analysis for a study where we need to assess the effect of surgery A (hand surgery) on condition B (trigger digit), adjusting for confounders via logistic regression.
The problem is that we have data from two data sets:
Set1: All…
Bakaburg
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1
vote
1 answer
Is this a case control study or a retrospective cohort study?
From the echocardiography database at a tertiary care center, 1,625 subjects (mean age, 44 6 14 years; 47% men) with normal echocardiographic findings between 2000 and 2009 were identified. Gender dif- ferences and association with body surface area…
user24545
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vote
4 answers
Valid conclusions from simple case?
If I have an experiment documenting the recovery of 1,000 patients who were given access to a medication.
Results:
MEN taking the drug.
2 out of 2 recover (100% recovery).
MEN not taking the drug.
400 out of 498 recover (80.3% recovery).
WOMEN…
Chicago1988
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0
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1 answer
Which study design is best for the following?
I have a data set in which all patients have a particular disease. The disease has three varieties labeled as 0, 1, and 2 in the data set. I want to know the association of a particular drug with this disease. Some of the patients are taking the…
0
votes
1 answer
Matched case control study design
I have a few questions about matched case-control study design. How do we handle matched case-control study design if you don’t have matched controls for all the cases? Would you remove unmatched case from the cohort? Also, how to handle if I need…
Winmoon
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Does "ds" have any statistical meaning?
I was reading a research paper and was wondering if "ds= .56 to .63" was a quantitative means of measuring the study, or if it was related to referencing?
sigte
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Case control study for a beginner student
I am a medical student and new to this site so please be patient with me.
I am doing a study on effect of zinc on bronchiolitis in children,taking clinical findings over time period in patients given zinc and patients not given zinc (control) for…
