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 ( @ % vs @ % , relative risk -LSB- RR -RSB- @ -LSB- @ , @ -RSB- ) , or the resectable/no pain stratum ( @ % vs @ % , RR @ -LSB- @ , @ -RSB- ) .