To the Editor:—
Our article, "Continuing Medical Education Through Television" (200:762, 1967), was the subject of a letter to The Journal by Dr. Charles E. Lewis (201:709, 1967). He criticized three aspects of our work:
stimuli, the identical printed questionnaire. The responses of the physicians to questions by telephone may not be entirely comparable, but it is difficult to believe that physicians reporting their television viewing would be influenced by the method of communication used to obtain this kind of information.
He questioned the representativeness of the sample of physicians from which our findings were derived. The study, however, was designed and the sample was obtained in accordance with well-accepted sampling procedures which are described in standard texts.
He doubted the comparability of the responses of the three groups of participants. The responses of the first and second groups are comparable since they involve the same