RESULTS	At the 2-year follow-up , the mean differences were slightly less : 7.8 in disability ( 95 % CI , 0.8-14 .9 ) 1.5 in leg pain ( 95 % CI , 0.3-2 .8 ) , and 2.1 in back pain ( 95 % CI , 1.0-3 .3 ) .\