which were contained in identical
bottles. A statistician performed
primary analyses while the research staff
remained blind to medication assignment.
To determine the effectiveness
of blinding procedures, patients,
physicians, and therapists were asked
upon study termination to guess each
patient’s assignment. Psychiatrists (2=
8.14, P=.004) and patients (2=5.49,
P=.02) guessed the correct medication
assignment more frequently than
chance, while therapists did not
(2=1.94, P=.16).
which were contained in identicalbottles. A statistician performedprimary analyses while the research staffremained blind to medication assignment.To determine the effectivenessof blinding procedures, patients,physicians, and therapists were askedupon study termination to guess eachpatient’s assignment. Psychiatrists (2=8.14, P=.004) and patients (2=5.49,P=.02) guessed the correct medicationassignment more frequently thanchance, while therapists did not(2=1.94, P=.16).
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