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Table 3 Adequacy of the randomisation process

From: Systematic review of information and support interventions for caregivers of people with dementia

1) Adequate
i) a central allocation process by an office or third party unaware of subject characteristics
ii) pre-numbered packages of support administered to carers sequentially
iii) use of an on-site or coded computer system with a locked, unreadable file with allocation occurring only after carers or patient details are inputted
iv) assignment via scaled, numbered and opaque envelopes
v) other combinations which provide evidence of adequacy in concealment
2) Unclear
i) study used list or tables to allocate assignments
ii) use of "envelopes" or" sealed envelopes
iii) simply stating that the study was randomised with no further details
3) Inadequate
i) by using case numbers, dates of birth, age group, alternation or date of referral and other similar methods
ii) use of any other system in which allocation can be known in advance such as pre-printed lists of random numbers or open computer allocation lists.