RESULTS	The greatest changes in pain assessed using either the VAS or VRS were between the pretreatment scores and those after 6 months ( 7.7 + / - 1.3 vs. 4.6 + / - 3.0 for VAS , P < 0.001 ; and 25 + / - 13.8 vs. 19 + / - 18.9 for VRS , P < 0.002 ) .\