RESULTS	At 1 year , the mean difference in favor of surgery was 11.3 in disability ( 95 % confidence interval [ CI ] , 4.3-18 .4 ) , 1.7 in leg pain ( 95 % CI , 0.4-3 .0 ) , and 2.3 ( 95 % CI , 1.1-3 .6 ) in back pain .\