The function returns a dataframe with:
x1, x2, x3, x4, x5, x6= patient covariates.
t= treatment assignment (0 for control, 1 for active).
logit.control= the logit of the probability of an outcome in the control treatment.
logit.active= the logit of the probability of an outcome in the active treatment.
benefit= treatment benefit in log odds ratio.
py=the probability of the outcome for each patient, under the treatment actually administered.
logit.py= the logit of py.
y.observed= the observed outcome