The proportion of patients cured was similar in the two treatment groups in the intention-to-treat population ( 80.3 % in the clindamycin group and 77.7 % in the TMP-SMX group ; difference , -2.6 percentage points ; 95 % confidence interval [ CI ] , -10.2 to 4.9 ; P = 0.52 ) and in the populations of patients who could be evaluated ( 466 patients ; 89.5 % in the clindamycin group and 88.2 % in the TMP-SMX group ; difference , -1.2 percentage points ; 95 % CI , -7.6 to 5.1 ; P = 0.77 ) .