Table 1:

Breakdown of diskography in 11,599 exams on 10,229 patients

Anatomic Level	No. of Exams by Level	No. of Disks Examined by Level	No. of Unsuccessful Exams*
Cervical	2085	5981	53
Thoracic	1141	3083	17
Lumbar	9408	28071	63
Total	12634	37135	133

^*Number of exams in which 1 or more diskography levels were unsuccessful or not attempted.