Nelson E C, Jacobs A R, Breer P E, Johnson K G
Ann Intern Med. 1975 May;82(5):608-12. doi: 10.7326/0003-4819-82-5-608.
The addition of a physician's assistant to an ambulatory care practice increases the practice's productivity. Practices using physician's assistants (medexes) had a 12% increase in the number of patient visits during the first year of training and 1 3/4 years later had an average increase of 37%. The medex by himself provided care to 28% of the patients and, in company with the physician, to another 10%. No consistent changes across practices were noted in patient waiting times or time physicians spend with patients.
在门诊医疗业务中增加一名医师助理可提高业务效率。使用医师助理（医疗助理）的业务在培训的第一年患者就诊次数增加了12%，在1又3/4年后平均增加了37%。医疗助理独自为28%的患者提供护理，与医师一起又为另外10%的患者提供护理。在患者等待时间或医师与患者相处时间方面，各业务之间未发现一致的变化。
