A total of 98 participants with LBP were randomized to 3 groups : ( 1 ) standard care ( SC ) group , which included medication and physical therapy ( n = 29 ) , ( 2 ) SC with eLSO ( eLSO group ) ( n = 32 ) , and ( 3 ) SC with iLSO ( iLSO group ) ( n = 37 ) .