Table 2.

Observers skills and level of expertise for diagnosing DISH on chest CT

	Job title	Expertise levela	Reading chest CTb
Observer 1	Junior resident	II	3
Observer 2	Junior resident	II	3
Observer 3	Senior resident	III	5
Observer 4	Orthopaedic surgeon	V	10
Observer 5	Chest radiologist	V	15

^aLevel of expertise based on ref. [8]: I = has knowledge and some skills; II = acts under strict supervision; III = acts under limited supervision; IV = acts without supervision; V = supervises and teaches

^bYears since the observer started reading and evaluating chest CT scans