Randomisation and masking
Patients were randomly assigned to one of two treatment
groups (simple randomisation with 1:1 ratio, no
blocking, stratifi ed by hospital). Random allocations
were com puter-generated on a hand-held device, at the
point of each patient’s study entry, and thus wereconcealed to patients, clinical staff , and research staff
until this time. Patients and clinical staff could not be
masked after allocation because of the nature of the
intervention. Research nurses were similarly not
masked because they had to allocate patients to the
treatment group and monitor the integrity of the
intervention. However, laboratory staff were masked for
rating of all microbiological endpoints, and a masked,
independent medical rater diagnosed catheter-related
infections and all bloodstream infections. We did
blinded inter-rater reliability checks on a subset of
phlebitis assessments.
Randomisation and masking
Patients were randomly assigned to one of two treatment
groups (simple randomisation with 1:1 ratio, no
blocking, stratifi ed by hospital). Random allocations
were com puter-generated on a hand-held device, at the
point of each patient’s study entry, and thus wereconcealed to patients, clinical staff , and research staff
until this time. Patients and clinical staff could not be
masked after allocation because of the nature of the
intervention. Research nurses were similarly not
masked because they had to allocate patients to the
treatment group and monitor the integrity of the
intervention. However, laboratory staff were masked for
rating of all microbiological endpoints, and a masked,
independent medical rater diagnosed catheter-related
infections and all bloodstream infections. We did
blinded inter-rater reliability checks on a subset of
phlebitis assessments.
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