Anthony Camilli, MD
To the Editor: In their paper, "Asthma in Respiratory Therapists," Kern and Frumkin (1) discuss the potential effects of bias and confounding on their results; however, they do not provide information on the most likely source of bias, that of persons with respiratory symptoms (undiagnosed asthmatics) entering the profession of respiratory therapy and then being diagnosed as asthmatics after they are in the profession. The high prevalence of respiratory symptoms in those who become respiratory therapists is suggested by the high prevalence of asthma among respiratory therapists who developed asthma before work onset, derived from Table 5 (11.4% compared with
Camilli A. Asthma in Respiratory Therapists. Ann Intern Med. ;111:620. doi: 10.7326/0003-4819-111-7-620_1
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Published: Ann Intern Med. 1989;111(7):620.
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