FM
audits
We will analyse data from fortnightly cleaning audits using a binomial generalised linear mixed model with a logit link function on the proportion of equipment that were deemed ‘cleaned’. A random intercept will be included for each ward. The effect of the intervention will be tested in three ways: a binary intervention effect, to model an immediate improvement in cleaning; a linear intervention effect, defined as weeks after each ward’s intervention start date, to model a more gradual improvement over time; and a combined binary–linear intervention effect. As per the analysis of the primary outcome, the intervention effect will switch from ‘no’ to ‘yes’ 1 week after the start of the intervention period.