warfarin, or alteplase. Because simple minimisation
within centres can lead to alternation of treatment
allocation and thus potential loss of allocation
concealment, our system also incorporated a degree of
random allocation—ie, patients were allocated to the
treatment group that would minimise the diff erence
between the groups with a probability of 0·80.
For patients allocated to thigh-length GCS, stockings
were to be applied to both legs as soon as possible after
randomisation and then worn day and night until either
the patient was independently mobile around the ward;
they were discharged from the recruiting centre; the
patient refused to wear them; or the staff became
concerned about the patient’s skin. We asked centres to
record their use of GCS on the medication chart in the
same way as for prescribed drugs to help increase
compliance and to help with monitoring. The date of,
and reason for, early removal of GCS was collected.
Patients allocated to avoid GCS were not to be fi tted with
stockings unless a clear indication for their use developed.
Both groups were to be given the same routine care that
could have included, depending on local protocols, early
mobilisation, hydration, and antiplatelet and anticoagulant
drugs. We monitored antiplatelet and
anticoagulant use throughout follow-up.
The primary outcome was a defi nit
warfarin, or alteplase. Because simple minimisationwithin centres can lead to alternation of treatmentallocation and thus potential loss of allocationconcealment, our system also incorporated a degree ofrandom allocation—ie, patients were allocated to thetreatment group that would minimise the diff erencebetween the groups with a probability of 0·80.For patients allocated to thigh-length GCS, stockingswere to be applied to both legs as soon as possible afterrandomisation and then worn day and night until eitherthe patient was independently mobile around the ward;they were discharged from the recruiting centre; thepatient refused to wear them; or the staff becameconcerned about the patient’s skin. We asked centres torecord their use of GCS on the medication chart in thesame way as for prescribed drugs to help increasecompliance and to help with monitoring. The date of,and reason for, early removal of GCS was collected.Patients allocated to avoid GCS were not to be fi tted withstockings unless a clear indication for their use developed.Both groups were to be given the same routine care thatcould have included, depending on local protocols, earlymobilisation, hydration, and antiplatelet and anticoagulantdrugs. We monitored antiplatelet andanticoagulant use throughout follow-up.The primary outcome was a defi nit
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