The ODI scores improved by a mean of 2.4 ( 95 % confidence interval [ CI ] , 2.2-7 .1 ) , 8.1 ( 95 % CI , 2.8-13 .4 ) , and 14.0 ( 95 % CI , 8.2-19 .8 ) points for SC , eLSO , and iLSO groups , respectively .