There was an increased risk of resistant infection among isolates usually sensitive to quinolones in the levofloxacin group vs placebo ( 14/24 [ 58.3 % ] vs 15/45 [ 33.3 % ] , respectively ; risk ratio , 1.75 ; 95 % CI , 1.01-2 .98 ) as well as a nonsignificant increased risk of suspected tendinitis ( 6/76 [ 7.9 % ] vs 1/78 [ 1.3 % ] ; risk ratio , 6.16 ; 95 % CI , 0.76-49 .95 ) .