The primary endpoint , the percentage of PPA patients experiencing a worsening of pain compared with preoperative baseline for resectable patients , was not different between the ethanol and saline groups in either the resectable/pain stratum ( 22 % vs 18 % , relative risk [ RR ] 1.23 [ 0.34 , 4.46 ] ) , or the resectable/no pain stratum ( 37 % vs 34 % , RR 1.10 [ 0.67 , 1.81 ] ) .