Table 1.

Sample size attrition table

Attrition criterion	N	Percent
At least one spinal cord injury (SCI) diagnosis during January 1, 2006–June 30, 2011	46,931	100.0
Continuous medical and pharmacy benefit enrollment 6 months prior to first SCI diagnosis	19,449	41.4
No SCI diagnosis during the 6 months before the first SCI diagnosis	16,774	35.7
No neuropathic pain (NeP) diagnosis or NeP-related drugs during the 6 months before the first SCI diagnosis	11,705	24.9
NeP diagnosis or NeP-related drug within 12 months following first SCI diagnosis (NeP index event)a	1,603	3.4
Continuous medical and pharmacy benefit enrollment 6 months prior to NeP index event	1,542	3.3
Continuous medical and pharmacy benefit enrollment 12 months following NeP index event	1,116	2.4
No evidence of seizure disorders, multiple sclerosis, amyotrophic lateral sclerosis, diabetic peripheral neuropathy, postherpetic neuralgia, or related medications during pre or postindex periods	708	1.5
Age ≥18 years of age at date of first found SCI event	581	1.2
Patients included in final SCI-NeP cohort after propensity score matching processa	546	1.2

Note:

^aMatched patients had no evidence of NeP diagnosis or NeP-related drugs between January 1, 2005 and June 30, 2012, but otherwise the same selection criteria as the matched SCI-NeP patients.