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Thus, significant comparisons identified by the Bonferroni method were also invariably detected by the Benjamini and Hochberg adjustment, which revealed additional significant differences that were also regarded as possibly meaningful.

Patients with bacteremias classified as belonging to each of the 5 groups were compared for age by one-way analysis of variance.

The Ryan-Einot-Gabriel-Welsch multiple-range test was used for pairwise comparisons between groups, controlling for the experiment-related error [4].

During 1997, a total of 1028 episodes of bacteremia occurred among 912 patients who were admitted to the hospital 964 times.

Four distinct modes of non–hospital-acquired infection were thus defined: true community-acquired infection, recent hospitalization–related infection, procedure-related infection, and nursing home–acquired infections.

Distribution of 604 episodes of community-acquired bacteremia that occurred within 48 h of admission to the hospital, according to the proposed new classification of circumstances of acquisition of infection.

These simple and easy-to-use definitions are widely used in most clinical studies of bloodstream infections (BSIs).the first 48 h of admission were classified into 4 groups (groups A–D).“Group A” included true community-acquired bacteremias found in patients admitted to the hospital from home without having been hospitalized within the past 30 days and without a history of undergoing an invasive procedure either just before or at the time of admission.Bacteremias that occurred in patients receiving long-term dialysis or in patients admitted with intravascular devices were excluded from this group.“Group B” consisted of bacteremias found in patients who were recently discharged from the hospital (2–30 days before the current admission).Table 2 shows the types of invasive procedures performed either before or at the time of admission for patients with group C1 or C2 bacteremia.Because all subgroups of group C (table 1) represented a similar concept of infection acquisition, and because each subgroup was relatively small, it was decided to combine all of these subgroups in the "group C" classification (procedure-related infection).

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