Figure 6.

Variables analyzed for association with successful or unsuccessful outcome of SCS treatment, based on a binary transformation of EoS levels. Each point is the coefficient value from ordered logit regression; lines indicate 95% confidence intervals. Positive coefficient values indicate a stronger association to an unsuccessful outcome. DDD, the total number of defined daily doses dispensed to a patient in the 12 months before implantation. Group “Other” refers to a group of indications made up of all treatment indications except “persistent spinal pain syndrome, type 1 or 2” as defined by indication groups in RAY, a local quality registry for implantable neurostimulation therapies for pain at the Uppsala University Hospital, Sweden. Burst, a 5-pulse train paresthesia-free waveform with internal frequency of 500 Hz delivered at 40 Hz using a passive recharge pattern. 10 kHz, a paresthesia-free, 10-kHz, continuous, spinal cord stimulation waveform. Tonic refers to a 30- to 80-Hz, continuous, spinal cord stimulation waveform producing paresthesia. See appendix for data in table format, available at http://links.lww.com/PR9/A210. SCS, spinal cord stimulation.