TB or Not TB

This table shows the results of a controlled experiment to determine the efficacy of streptomycin for treating patients diagnosed with Tuberculosis (TB). The experiment was conducted in 1948 by Ausin Bradford Hill. Mr. Hill randomly assigned patients to either receive the new medicine or just bed rest.

The variables are:

• treatment: Whether the patient was given streptomycin, an experimental medication to treat TB, or whether the patient was in the control group and received only bed rest.
• outcome: Whether the patient ultimately died or recovered.

treatment	outcome
control	recovered
streptomycin	recovered
control	recovered
control	died
control	recovered
streptomycin	died
control	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
control	died
control	recovered
control	recovered
streptomycin	recovered
control	died
control	recovered
control	recovered
control	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
control	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
control	recovered
control	died
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
control	recovered
control	died
streptomycin	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
control	died
streptomycin	recovered
control	died
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
control	died
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	died
control	recovered
streptomycin	recovered
control	recovered
control	died
streptomycin	recovered
streptomycin	died
control	died
streptomycin	recovered
control	recovered
streptomycin	recovered
control	recovered
control	recovered
streptomycin	recovered
control	recovered
control	recovered
streptomycin	recovered
control	died
control	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
streptomycin	recovered
control	died
control	recovered
control	died
streptomycin	died
control	died
control	recovered
streptomycin	recovered
control	recovered
streptomycin	recovered