This article has ignored one potential confounding factor. Older physicians are more experienced, and are therefore more likely to be assigned the more challenging and difficult patients, who are likely to have a greater mortality rate regardless of who is treating them. Also, if they have been treating their patients for a number of years, the average age of these patients may be older than the group treated by younger physicians.
Additionally, those treating large numbers of patients tend to be running day clinics with relatively well patients, and are likely to be dealing with a group which is on the whole not as sick as those treated by the older consultants. and therefore less likely to die.
Until this article is rewritten to account for these potential differences in the type of patients treated, the findings should at best be regarded as unproven.
Competing interests: No competing interests