In phase 2 , patients receiving stratified care ( n = 67 ) had greater between-group improvements in NPRS ( 0.8 points ; 95 % confidence interval = 0.1 , 1.5 ; d = 0.40 ) and ODI ( 8.9 % points ; 95 % confidence interval = 4.1 , 13.6 ; d = 0.76 ) scores compared with patients receiving standard physical therapy care ( n = 33 ) .