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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.
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