Volunteers' perception of pain associated with injections using different needle types on (a) the Visual Analog Scale (VAS) and (b) the Verbal VAS (VB-VAS) in the single-center French study (n = 120). The number next to the key indicates the magnitude of mean pain associated with each needle: 1 = lowest level of pain; 8 = highest level of pain. aNeedle currently used for the injection of interferon beta-1a (IFN β-1a), 44 or 22 mcg subcutaneously three times weekly. bSilicone lubricant B was used with this needle; for all other needles, silicone lubricant A was used. cNeedle used previously for the injection of IFN β-1a, 44 or 22 mcg sc tiw. CI, confidence interval; G, gauge; TPE, Thermo Plastic Elastomer.
Jaber et al. BMC Neurology 2008 8:38 doi:10.1186/1471-2377-8-38