the occurrence of side effects that necessitated discontinuation
of treatment with the study medication
within the first 48 hours, or any one of
the following before the test-of-cure visit: occurrence
of a skin infection at a new body site,
unplanned surgical treatment of the skin infection,
or hospitalization related to the infection.
The primary null hypothesis was that clindamycin
and TMP-SMX would have equal rates of cure.
The study was designed as a superiority trial with
80% power to detect an absolute difference between
the two treatment groups of 10 percentage
points in cure rates (85% vs. 95%) in the
population that could be evaluated, at an alpha
level of 0.05. Assuming a 20% attrition rate, we
calculated that 524 patients (262 in each group)
needed to be enrolled. The prespecified secondary
outcomes were cure rates at the end of treatment
and at the 1-month follow up visit; cure
rates in the adult and pediatric populations; cure
rates among patients with cellulitis, abscess, or
mixed abscess and cellulitis (defined as separate
lesions of abscess and cellulitis) at the test-ofcure
visit; and adverse-event rates. Comparisons
between groups were performed with the use of
Pearson’s chi-square test, Fisher’s exact test, or
an analysis-of-variance test, as appropriate; all tests
were two-sided. Interim analyses for safety were
performed by an independent data and safety
monitoring committee. Findings from the trial
are described in accordance with Consolidated
Standards of Reporting Trials (CONSORT) guidelines.
14
the occurrence of side effects that necessitated discontinuationof treatment with the study medicationwithin the first 48 hours, or any one ofthe following before the test-of-cure visit: occurrenceof a skin infection at a new body site,unplanned surgical treatment of the skin infection,or hospitalization related to the infection.The primary null hypothesis was that clindamycinand TMP-SMX would have equal rates of cure.The study was designed as a superiority trial with80% power to detect an absolute difference betweenthe two treatment groups of 10 percentagepoints in cure rates (85% vs. 95%) in thepopulation that could be evaluated, at an alphalevel of 0.05. Assuming a 20% attrition rate, wecalculated that 524 patients (262 in each group)needed to be enrolled. The prespecified secondaryoutcomes were cure rates at the end of treatmentand at the 1-month follow up visit; curerates in the adult and pediatric populations; curerates among patients with cellulitis, abscess, ormixed abscess and cellulitis (defined as separatelesions of abscess and cellulitis) at the test-ofcurevisit; and adverse-event rates. Comparisons between groups were performed with the use ofPearson’s chi-square test, Fisher’s exact test, oran analysis-of-variance test, as appropriate; all testswere two-sided. Interim analyses for safety wereperformed by an independent data and safetymonitoring committee. Findings from the trialare described in accordance with ConsolidatedStandards of Reporting Trials (CONSORT) guidelines.14
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