Sixty-seven patients completed the following outcomes prior to LS ( baseline ) , and @ , @ , @ , and @ months after LS : low back pain ( numeric rating scale ) , leg pain ( numeric rating scale ) , function ( Oswestry Disability Index ) , various beliefs and experiences related to LS ( @-item survey with Likert scale responses ) , and postoperative utilization of health care ( utilization of health care questionnaire ) .