Event
Group
Occurred (Y=1)
Not occurred (Y=0)
Total
Treatment (X=1)
a
b
a+b
Control (X=0)
c
d
c+d
Total
a+c
b+d
n
Table 1:
Two-by-two contingency table obtained from a randomized trial, where a, b, c, d, and n indicate the numbers of subjects
