Table 25: Summary: Levels of Evidence by Neuropathic Condition and Outcome of Interest.

	Primary Outcome for Systematic Review	Secondary Outcomes for Systematic Review
Neuropathic Pain Condition	Pain Relief	Functional Status	Quality of Life
Failed back surgery syndrome	Level 2 (1 study) Level 3a (1 study)	*Level 3a (1 study)	*Level 3a (1 study)
Complex regional pain syndrome Type I	Level 2 (1 study)	*Lack of evidence evidence	*Lack of evidence
Postherpetic neuralgia	†Level 3a (1 study)	†Level 3a (1 study)	Not assessed

^*Secondary measure for study.

^†A multiple outcome measure for study.