Table 1.

Equations for Antibiotic Consumption Metrics and colonization pressure DDD, defined daily dose; DOT, days of therapy; CP, colonization pressure.

Metrics	Equations
DDD per 1000 patient days	$\frac{{\displaystyle \sum }dispensed doses of meropenem, ertapenem, imipenem }{1000 \times patient days in a quarter}$
DOT per 1000 patient days	$\frac{{\displaystyle \sum }days that inpatients received \ge 1 dose of meropenem, ertapenem, and imipenem}{1000 \times patient days in a month}$ Days on which patients received more than one carbapenem are counted only once
CP	$\frac{{\displaystyle \sum } MDR - Ab patient days in a given unit in a month}{1000 \times patient days in a month in same unit}$