Epidemiologic Tables and Transforming Variables Day 4 Epidemiologic Tables and Transforming Variables

Incidence Rates Is there an association between breast cancer and exposure to multiple X-ray fluoroscopies (Howe, 1982)?

Incidence Rates iri 41 15 28010 19017

Cohort Studies Is there an association between mortality and low birthweight among infants (defined by birthweight < 2500g) in New York City in 1974?

Cohort Studies csi 618 422 4597 67093

Case Control Studies Is there an association between average daily alcohol consumption and esophageal cancer? (Tuyns, 1977).

Case Control Studies cci 96 104 109 666

Using cc or cs on “real data” What is the risk of death for individuals who have septicemia as a complication of abdominal aortic surgery compared to those who do not? cc death septicem cs death septicem

Matched Case Control Studies Are individuals who drink 6 or more cups of coffee per day at increased risk of myocardial infarction?

Matched Case Control Studies mcci 8 8 3 8

Transforming Variables What “transformation” should we use to normalize los? totchg? icuday? age?

Transforming Variables gladder sktest [ladder]

Conditional Statements if comes before the comma e.g. if age<50 if age>=50 if age==50 ci los if age<50 ci los if age<50, by(sex)

Conditional Statements and (&), or (|) ci los if age>50 & age<70 ci los if age<50 & sex==1 ci los if septic==1 | reintub==1